Liquid crystal display panel

ABSTRACT

A liquid crystal display panel includes a first substrate, a second substrate, a liquid crystal layer, a plurality of first regions and a plurality of second regions. The first regions and the second regions are formed on the first substrate and the second substrate. In a narrow viewing mode, the luminous flux of the first regions along a first viewing direction is different from that of the first regions along a second viewing direction opposite to the first viewing direction, and the luminous flux of the second regions along the first viewing direction is substantially different from that of the first regions along the first viewing direction.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional of application Ser. No. 13/189,556filed Jul. 24, 2011, which is incorporated by reference herein in itsentirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a liquid crystal display panel, andmore particularly, to a liquid crystal display panel able to provideanti-peeping effect.

2. Description of the Prior Art

Generally, a display device is provided with wide viewing angle suchthat more users can see the images displayed by the display device.However, under some circumstances, such as when reading confidentialdata or when inputting password, the wide viewing angle display effectmakes it possible for other people around the display device to see theconfidential data, which increases the risk of data leak. Therefore, tofulfill the two different requirements of providing images for moreusers at the same time and reading confidential data in public placewherever necessary, a display device that can be switched between a wideviewing angle mode and a narrow viewing angle mode has been expected asa mainstream product in display device market.

The conventional anti-peeping mechanisms for display device can bemainly classified as the following approaches:

1. Adding Additional Anti-Peeping Film to the Surface of Substrate ofthe Display Device:

The anti-peeping film can restrain the brightness of wider viewingangle, and thus people aside the display device cannot clearly read thedisplayed image. The anti-peeping film is a commonly-used material,though; the additional anti-peeping film will adversely affects theoptical property and display quality of the display device whendisplaying images for the user in front of the display device. Also, theuser has to manually switch the anti-peeping film, which causesinconvenience.

2. Backlight Source Control:

The switching between wide viewing mode and narrow viewing mode can beachieved by using a backlight source with high collimation accompaniedwith a diffusion sheet able to be controlled by voltage e.g. a polymerdispersion liquid crystal (PDLC) film. For example, when no voltage isapplied, the diffusion sheet will diffuse the collimated backlight, sothat the backlight can emit in the side viewing direction. Thus, thewide viewing mode can be provided. When a voltage is applied, thediffusion sheet will not diffuse the collimated backlight. Thus, thenarrow viewing mode can be provided. To be exact, this approach adjustthe brightness of the backlight emitting in the side viewing directionby controlling the emitting angle of the backlight, so that peoplecannot see the display image in the side viewing direction. In practicalapplication, it is difficult to control the light route, and thus aperfect collimated backlight cannot be obtained. In such a case, thebrightness of the backlight emitting in the side viewing direction maybe reduced to a certain extent, but the brightness of the backlightemitting in the side viewing direction is yet not ignorable. As aresult, the anti-peeping effect is not satisfactory.

3. Adding a Viewing Angle Control Module:

The switching between wide viewing mode and narrow viewing mode can beachieved by adding an additional viewing angle control module to thedisplay device (panel). In the wide viewing mode, the viewing anglecontrol module does not cause any interference or damage on thedisplayed image; in the narrow viewing mode, the viewing angle controlmodule can restrain the brightness in the side viewing direction, suchthat people cannot clearly read the display image in the side viewingdirection. However, this approach requires two modules including thedisplay module and the additional viewing angle control module, and thusthe overall weight and thickness is doubled. Also, the cost is highlyincreased.

It can be seen that the aforementioned conventional anti-peepingapproaches have to sacrifice some of the original characteristics suchas display quality, optical property, thickness and weight for providingthe anti-peeping effect, and thus need to be improved.

SUMMARY OF THE INVENTION

It is therefore one of the objectives of the present invention toprovide a liquid crystal display panel to provide effective anti-peepingeffect without increasing cost and process complexity.

According to one embodiment, a liquid crystal display panel is provided.The liquid crystal display panel includes a first substrate, a secondsubstrate, a liquid crystal layer, a plurality of first regions, aplurality of second regions, a plurality of first pixel electrodes and aplurality of second pixel electrodes. The second substrate is disposedoppositely to the first substrate. The liquid crystal layer is disposedbetween the first substrate and the second substrate. The first regionsand the second regions are formed on the first substrate and the secondsubstrate. Each of the first regions has a first main region and a firstsub region, and each of the second regions has a second main region anda second sub region. The first pixel electrodes and the second pixelelectrodes are disposed on the first substrate, wherein each of thefirst pixel electrodes is disposed in each of the first regions,respectively, each of the second pixel electrodes is disposed in each ofthe second regions, respectively. The first pixel electrode and thesecond pixel electrode have different electrode patterns, each of thefirst pixel electrodes comprises a first main pixel electrode and afirst sub pixel electrode, each of the second pixel electrodes comprisesa second main pixel electrode and a second sub pixel electrode, thefirst main pixel electrode is disposed in the first main region, thefirst sub pixel electrode is disposed in the first sub region, thesecond main pixel electrode is disposed in the second main region, andthe second sub pixel electrode is disposed in the second sub region. Thefirst main pixel electrode and the second main pixel electrode aremirror symmetric with respect to a symmetry axis, and the first subpixel electrode and the second sub pixel electrode are mirror symmetricwith respect to the symmetry axis.

According to another embodiment, a liquid crystal display panel isprovided. The liquid crystal display panel includes a first substrate, asecond substrate, a liquid crystal layer, a plurality of first regions,a plurality of second regions, a plurality of third regions, a pluralityof fourth regions and a plurality of pixel electrodes. The secondsubstrate is disposed oppositely to the first substrate. The liquidcrystal layer is disposed between the first substrate and the secondsubstrate. The first regions, the second regions, the third regions andthe fourth regions are formed on the first substrate and the secondsubstrate. The pixel electrodes disposed are on the first substrate,wherein the pixel electrodes disposed in the first region, the secondregion, the third region and the fourth region have different pixelelectrode patterns, and the pixel electrodes disposed in the firstregion, the second region, the third region and the fourth region areelectrically connected to different pixel switching devices. The liquidcrystal display panel comprises a first domain, a second domain, a thirddomain and a fourth domain, the first regions are disposed in the firstdomain, the second regions are disposed in the second domain, the thirdregions are disposed in the third domain, and the fourth regions aredisposed in the fourth domain. In a narrow viewing mode, the luminousflux of the first regions along a first viewing direction is differentfrom that of the first regions along a second viewing direction, a thirdviewing direction and a fourth viewing direction different from thefirst viewing direction, the luminous flux of the second regions alongthe second viewing direction is different from that of the secondregions along the first viewing direction, the third viewing directionand the fourth viewing direction, the luminous flux of the third regionsalong the third viewing direction is different from that of the thirdregions along the first viewing direction, the second viewing directionand the fourth viewing direction, the luminous flux of the fourthregions along the fourth viewing direction is different from that of thefourth regions along the first viewing direction, the second viewingdirection and the third viewing direction, the luminous flux of thefirst regions along the first viewing direction is different from thoseof the second regions, the third regions and the fourth regions alongthe first viewing direction, the luminous flux of the second regionsalong the second viewing direction is different from those of the firstregions, the third regions and the fourth regions along the secondviewing direction, the luminous flux of the third regions along thethird viewing direction is different from those of the first regions,the second regions and the fourth regions along the third viewingdirection, and the luminous flux of the fourth regions along the fourthviewing direction is different from those of the first regions, thesecond regions and the third regions along the fourth viewing direction.

According to another embodiment, a liquid crystal display panel isprovided. The liquid crystal display panel includes a first substrate, asecond substrate, a liquid crystal layer, a plurality of first regions,a plurality of second regions, a first domain, a second domain, aplurality of first pixel electrodes and a plurality of second pixelelectrodes. The second substrate is disposed oppositely to the firstsubstrate. The liquid crystal layer is disposed between the firstsubstrate and the second substrate. The first regions and the secondregions are formed on the first substrate and the second substrate. Eachof the first regions has a first main region and a first sub region, andeach of the second regions has a second main region and a second subregion. The first pixel electrodes and the second pixel electrodes aredisposed on the first substrate. Each of the first pixel electrodescomprises a first main pixel electrode and a first sub pixel electrode,the first main pixel electrode is disposed in the first main region, andthe first sub pixel electrode is disposed in the first sub region. Eachof the second pixel electrodes comprises a second main pixel electrodeand a second sub pixel electrode, the second main pixel electrode isdisposed in the second main region, and the second sub pixel electrodeis disposed in the second sub region. Each of the first pixel electrodesis disposed in each of the first regions, respectively, and each of thesecond pixel electrodes is disposed in each of the second regions,respectively. The first pixel electrode and the second pixel electrodehave different electrode patterns, the first domain includes a pluralityof first regions disposed immediately adjoining to each other, and thesecond domain includes a plurality of second regions disposedimmediately adjoining to each other.

According to still another embodiment, a liquid crystal display panel isprovided. The liquid crystal display panel includes a first substrate, asecond substrate, a liquid crystal layer, a plurality of first regions,a plurality of second regions, a first domain, a second domain, aplurality of first pixel electrodes and a plurality of second pixelelectrodes. The second substrate is disposed oppositely to the firstsubstrate. The liquid crystal layer is disposed between the firstsubstrate and the second substrate. The first regions and the secondregions are formed on the first substrate and the second substrate,wherein each of the first regions has a first main region and a firstsub region, and each of the second regions has a second main region anda second sub region. The first pixel electrodes are disposed on thefirst substrate, wherein each of the first pixel electrodes comprises afirst main pixel electrode and a first sub pixel electrode, the firstmain pixel electrode is disposed in the first main region, and the firstsub pixel electrode is disposed in the first sub region. The secondpixel electrodes are disposed on the first substrate, wherein each ofthe second pixel electrodes comprises a second main pixel electrode anda second sub pixel electrode, the second main pixel electrode isdisposed in the second main region, the second sub pixel electrode isdisposed in the second sub region, each of the first pixel electrodes isdisposed in each of the first regions, respectively, each of the secondpixel electrodes is disposed in each of the second regions,respectively, the first pixel electrode and the second pixel electrodehave different electrode patterns, the first domain includes a pluralityof first regions disposed immediately adjoining to each other, and thesecond domain includes a plurality of second regions disposedimmediately adjoining to each other. Each of the first main pixelelectrodes consists of a first trunk electrode, a second trunk electrodeand a plurality of first branches, the first trunk electrode and thesecond trunk electrode of each of the first main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly to form an L-shaped structure, the first branches ofeach of the first main pixel electrodes are electrically connected toone of the first trunk electrode and the second trunk electrode, thefirst branches of each of the first main pixel electrodes aresubstantially arranged in parallel, each of the second main pixelelectrodes consists of a first trunk electrode, a second trunk electrodeand a plurality of first branches, the first trunk electrode and thesecond trunk electrode of each of the second main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly to form an L-shaped structure, the first branches ofeach of the second main pixel electrodes are electrically connected toone of the first trunk electrode and the second trunk electrode, thefirst branches of each of the second main pixel electrodes aresubstantially arranged in parallel, and the first branches of each ofthe first main pixel electrodes and the first branches of each of thesecond main pixel electrodes are arranged along different directions.Each of the first sub pixel electrodes consists of a first trunkelectrode, a second trunk electrode, a third trunk electrode, aplurality of first branches, a plurality of second branches and aplurality of third branches, the first trunk electrode and the secondtrunk electrode of each of the first sub pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly to form a T-shaped structure, the second trunk electrodeand the third trunk electrode of each of the first sub pixel electrodesare electrically connected to each other and substantially arrangedperpendicularly to form an L-shaped structure, the first branches, thesecond branches and the third branches of each of the first sub pixelelectrodes are electrically connected to one of the first trunkelectrode, the second trunk electrode and the third trunk electrode, thefirst branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the second branches of each of thefirst sub pixel electrodes are substantially arranged in parallel, thethird branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the first branches, the secondbranches and the third branches of each of the first sub pixelelectrodes are arranged along different directions, each of the secondsub pixel electrode consists of a first trunk electrode, a second trunkelectrode, a third trunk electrode, a plurality of first branches, aplurality of second branches and a plurality of third branches, thefirst trunk electrode and the second trunk electrode of each of thesecond sub pixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly to form a T-shaped structure, thesecond trunk electrode and the third trunk electrode of each of thesecond sub pixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly to form an L-shaped structure,the first branches, the second branches and the third branches of eachof the second sub pixel electrodes are electrically connected to one ofthe first trunk electrode, the second trunk electrode and the thirdtrunk electrode, the first branches of each of the second sub pixelelectrodes are substantially arranged in parallel, the second branchesof each of the second sub pixel electrodes are substantially arranged inparallel, the third branches of each of the second sub pixel electrodesare substantially arranged in parallel, and the first branches, thesecond branches and the third branches of each of the second sub pixelelectrodes are arranged along different directions.

The liquid crystal display panel of the present invention can provideexcellent anti-peeping effect by modifying the pattern design of pixelelectrode without changing or adding manufacturing process, and the costand process complexity are not increased.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic diagram illustrating a liquid crystal displaypanel according to a preferred embodiment of the present invention.

FIG. 1B is a schematic diagram illustrating a relation between relativetransmittance brightness and a horizontal viewing angle of a first mainregion and a second main region of the liquid crystal display panel ofFIG. 1A.

FIG. 2A illustrates the liquid crystal display panel of the presentembodiment in a wide viewing mode.

FIG. 2B illustrates the liquid crystal display panel of the presentembodiment in a narrow viewing mode.

FIG. 3 illustrates the liquid crystal display panel of the presentembodiment in a wide viewing angle mode when viewing in a front viewingdirection and in a side viewing direction.

FIG. 4 illustrates the liquid crystal display panel of the presentembodiment in a narrowing viewing angle mode when viewing in a frontviewing direction and in a side viewing direction.

FIG. 5A illustrates the liquid crystal display panel in a wide viewingmode.

FIG. 5B illustrates the liquid crystal display panel in a narrow viewingmode.

FIG. 6A is a circuit diagram of the liquid crystal display panel in awide viewing mode.

FIG. 6B is a circuit diagram of the liquid crystal display panel in anarrow viewing mode.

FIG. 7A is a circuit diagram of the liquid crystal display panel in awide viewing mode.

FIG. 7B is a circuit diagram of the liquid crystal display panel in anarrow viewing mode.

FIG. 8 is a schematic diagram illustrating a first pixel electrode and asecond pixel electrode of the liquid crystal display panel according toa first preferred embodiment of the present invention.

FIG. 9 is a schematic diagram illustrating a first pixel electrode and asecond pixel electrode of the liquid crystal display panel according toa variant embodiment of the first preferred embodiment of the presentinvention.

FIG. 10 is a schematic diagram illustrating a first pixel electrode anda second pixel electrode of the liquid crystal display panel accordingto a second preferred embodiment of the present invention.

FIG. 11 is a schematic diagram illustrating a first pixel electrode anda second pixel electrode of the liquid crystal display panel accordingto a variant embodiment of the second preferred embodiment of thepresent invention.

FIG. 12 is a schematic diagram illustrating a first pixel electrode anda second pixel electrode of the liquid crystal display panel accordingto a third preferred embodiment of the present invention.

FIG. 13 is a schematic diagram illustrating a liquid crystal displaypanel according to still another embodiment of the present invention.

FIG. 14 is a schematic diagram illustrating the liquid crystal displaypanel when viewed in a front viewing direction and different sideviewing directions.

DETAILED DESCRIPTION

To provide a better understanding of the present invention to theskilled users in the technology of the present invention, preferredembodiments will be detailed as follows. The preferred embodiments ofthe present invention are illustrated in the accompanying drawings withnumbered elements to elaborate the contents and effects to be achieved.

Please refer to FIG. 1A and FIG. 1B. FIG. 1A is a schematic diagramillustrating a liquid crystal display panel according to a preferredembodiment of the present invention, and FIG. 1B is a schematic diagramillustrating a relation between relative transmittance brightness and ahorizontal viewing angle of a first main region and a second main regionof the liquid crystal display panel of FIG. 1A. As shown in FIG. 1A, theliquid crystal display panel 10 of the present embodiment includes afirst substrate 13, a second substrate 14, and a liquid crystal layer16. The first substrate 13 and the second substrate 14 are disposedoppositely. The liquid crystal layer 16, disposed between the firstsubstrate 13 and the second substrate 14, includes a plurality of liquidcrystal molecules LC. The liquid crystal display panel 10 includes aplurality of first regions (or namely first view angle region) and aplurality of second regions (or namely second view angle region) formedon the first substrate 13 and the second substrate 14. The first regionmay be divided into a first main region (or namely first main view angleregion) 11 and a first sub region (or namely, first sub view angleregion, not shown), and the second region may be divided into a secondmain region (or namely second main view angle region) 21 and a secondsub region ((or namely second sub view angle region, not shown). For thesake of elaborating the viewing angle characteristic when the liquidcrystal molecules LC are tilted in different angle, FIG. 1A only showsthe first main region 11 and the second main region 21. As shown in FIG.1B, curve A shows the brightness of the first main region 11 whenviewing in different viewing angle in the horizontal direction, whilecurve B shows the brightness of the second main region 21 when viewingindifferent viewing angle in the horizontal direction. When viewing theliquid crystal display panel 10 in a front view direction, the firstmain region 11 and the second main region 21 have substantially the samebrightness. When viewing the liquid crystal display panel 10 in a sideview direction, the luminous flux of the first main region 11 issubstantially different from the luminous flux of the second main region21. Here, viewing in the front view direction means the viewingdirection of the viewer is approximately perpendicular to the surface ofthe liquid crystal display panel 10, while viewing in the side viewdirection means the viewing direction of the viewer and the surface ofthe liquid crystal display panel 10 have an included angle approximatelyless than 80 degrees. It is noted that a non-absolute value of theviewing angle is used to measure the viewing angle when comparing thebrightness of the first main region 11 and the second main region 21. Insuch a case, when the brightness of the first main region 11 and that ofthe second main region 21 are different in the same viewing angle, theviewer cannot precisely read the displayed images (pictures or texts) inthe side viewing direction. Consequently, the displayed images can bekept in secret.

Please refer to FIG. 2A, FIG. 2B, FIG. 3 and FIG. 4. FIG. 2A, FIG. 2B,FIG. 3 and FIG. 4 are schematic diagrams illustrating a liquid crystaldisplay panel according to a preferred embodiment of the presentinvention. FIG. 2A illustrates the liquid crystal display panel of thepresent embodiment in a wide viewing mode, FIG. 2B illustrates theliquid crystal display panel of the present embodiment in a narrowviewing mode, FIG. 3 illustrates the liquid crystal display panel of thepresent embodiment in a wide viewing angle mode when viewing in a frontviewing direction and in a side viewing direction, and FIG. 4illustrates the liquid crystal display panel of the present embodimentin a narrowing viewing angle mode when viewing in a front viewingdirection and in a side viewing direction. For example, as shown in FIG.2A, if the left side of the liquid crystal display panel 10 is definedas a first viewing direction (or namely first viewing angle direction)D1, and the right side of the liquid crystal display panel 10 is definedas a second viewing direction (or namely second viewing angle direction)D2, the luminous flux of the first main region 11 along the firstviewing direction D1 will be different from the luminous flux of thefirst main region 11 along the second viewing direction D2, and theluminous flux of the second main region 21 along the first viewingdirection D1 will be different from the luminous flux of the first mainregion 11 along the first viewing direction D1. The first viewingdirection D1 and the second viewing direction D2 may be exchanged ordefined in different manners as disclosed in the following description.In this embodiment, the electrode patterns of the first region 1 and thesecond region 2 are substantially symmetrical, which makes the luminousflux of the first main region 11 along the first viewing direction D1substantially larger than the luminous flux of the first main region 11along the second viewing direction D2. Similarly, the luminous flux ofthe second main region 21 along the second viewing direction D2 issubstantially larger than the luminous flux of the second main region 21along the first viewing direction D1, and the luminous flux of the firstmain region 11 along the first viewing direction D1 is substantiallylarger than the luminous flux of the second main region 21 along thefirst viewing direction D1. By virtue of the aforementioned distributionof luminous flux, the liquid crystal display panel 10 of the presentembodiment can be a viewing angle switchable liquid crystal displaypanel, in which one display region may be divided into a plurality ofdomains. For instance, as shown in FIG. 3, the liquid crystal displaypanel 10 may be defined to include a first domain (or namely first zone)101, a second domain (or namely second zone) 102, a third domain (ornamely third zone) 103 and a forth domain (or namely forth zone) 104 bya vertical base line V and a horizontal base line H, but not limitedthereto. The first domain 101 and the third domain 103 include aplurality of first regions 1, and the second domain 102 and the fourthdomain 104 include a plurality of second regions 2. As shown in FIG. 2Aand FIG. 3, in a wide viewing mode, all of the first regions 1 includingthe first main regions 11 and the first sub regions 12 and all of thesecond regions 2 including the second main regions 21 and the second subregions 22 are turned on. Since total amount of the tilted direction ofthe liquid crystal molecules of the first main region 11 and the firstsub region 12 is substantially symmetrical, and total amount of thetilted direction of the liquid crystal molecules of the second mainregion 21 and the second sub region 22 is substantially symmetrical, theliquid crystal display panel 10 of the present embodiment can providesufficient brightness toward the front viewing direction, the firstviewing direction D1 and the second viewing direction D2 for exhibitingwide viewing angle effect. On the other hand, as shown in FIG. 2B andFIG. 4, in a narrow viewing mode, the first main regions 11 in the firstdomain 101 and the first main regions 11 in the third domain 103 areturned on while the first sub regions 12 in the first domain 101 and thefirst sub regions 12 in the third domain 103 are turned off, and thesecond main regions 21 in the second domain 102 and second main regions21 in the fourth domain 104 are turned on while the second sub regions22 in the second domain 102 and the second sub regions 22 in the fourthdomain 104 are turned off. Accordingly, the liquid crystal display panel10 can provide brightness toward the front viewing direction, but onlythe turned-on first main regions 11 in the first domain 101 and firstmain regions 11 in the third domain 103 can provide brightness towardthe first viewing direction D1, and only the turned-on second mainregions 21 in the second domain 102 and second main regions 21 in thefourth domain 104 can provide brightness toward the second viewingdirection D2. In such a case, the viewer in the first viewing directionD1 or in the second viewing direction D2 cannot see the entire displayedimages clearly due to the interference caused by the difference ofluminous flux. Therefore, the liquid crystal display panel 10 canexhibit anti-peeping effect.

Please refer to FIG. 5A and FIG. 5B, as well as FIGS. 3-4. FIG. 5A andFIG. 5B are schematic diagrams illustrating a liquid crystal displaypanel according to another embodiment of the present invention. FIG. 5Aillustrates the liquid crystal display panel in a wide viewing mode, andFIG. 5B illustrates the liquid crystal display panel in a narrow viewingmode. As shown in FIG. 5A and FIG. 3, the liquid crystal display panel10 may be defined to include a first domain (or namely first zone) 101,a second domain (or namely second zone) 102, a third domain (or namelythird zone) 103 and a forth domain (or namely forth zone) 104 by avertical base line V and a horizontal base line H, but not limitedthereto. In this embodiment, each domain comprises a plurality of firstregions 1 including the first main regions 11 and the first sub regions12, and excludes the second regions 2. The design of the electrodepattern of the first subregions 12 of this embodiment is similar to thatof the second main regions 21 of the aforementioned embodiment, and thusthe same anti-peeping effect can be achieved. As shown in FIG. 3, in thewide viewing mode, the first main regions 11 and the first sub regions12 of the first domain 101, the second domain 102, the third domain 103and the fourth domain 104 are all turned on, and thus the liquid crystaldisplay panel 10 can provide sufficient brightness toward the frontviewing direction, the first viewing direction D1 and the second viewingdirection D2 for exhibiting wide viewing angle effect. As shown in FIG.5B and FIG. 4, in the narrow viewing mode, the first main region 11 ofthe first domain 101 and the first main region 11 of the third domain103 are turned on while the first sub region 12 of the first domain 101and first sub region 12 of the third domain 103 are turned off, and thefirst main region 11 of the second domain 102 and the first main region11 of the fourth domain 104 are turned off while the first sub region 12of the second domain 102 and the first sub region 12 of the fourthdomain 104 are turned on. Therefore, only the first main regions 11 ofthe first domain 101 and the third domain 103 can provide brightnesstoward the first viewing direction D1, and only the first sub regions 12of the second domain 102 and the fourth domain 104 can providebrightness toward the second viewing direction D2. In such a case, theviewer in the first viewing direction D1 or in the second viewingdirection D2 cannot see the entire displayed images clearly due to theinterference caused by the difference of luminous flux. Therefore, theliquid crystal display panel 10 can exhibit anti-peeping effect.

In the present invention, the different distribution of the luminousflux between the first region 1 and the second region 2 can be achievedby the pattern design of pixel electrode, but not limited thereto. Forinstance, the different distribution of the luminous flux between thefirst region 1 and the second region 2 can also be achieved by formingdifferent rubbing direction of alignment films or by disposingprotrusion bumps of different patterns in the first region 1 and thesecond region 2, respectively. The first main region 11 and the firstsub region 12 can form a sub pixel, and the second main region 21 andthe second sub region 22 can together form a sub pixel, but not limitedthereto. For example, the first main region 11 can form a sub pixel, thefirst sub region 12 can form a sub pixel, the second main region 21 canform a sub pixel, and the second sub region 22 can form a sub pixel. Inaddition, the first viewing direction D1 and the second viewingdirection D2 are not limited to be directions in the horizontaldirection e.g. left direction and right direction, and can be modifiedbased on different anti-peeping requirement. Also, the included anglebetween the first viewing direction D1 and the second viewing directionD2 is not limited to be 180 degrees, and can be any angle other than 0degree.

The optical mechanism of the liquid crystal display panel will bedetailed with reference to FIG. 2A and FIG. 2B. In this embodiment, theliquid crystal display panel 10 may be defined to include a plurality ofdomains such as a first domain 101, a second domain 102, a third domain103 and a forth domain 104 by a vertical base line V and a horizontalbase line H. In the first domain 101 and the third domain 103, aplurality of first regions 1 are disposed; in the second domain 102 andthe fourth domain 104, a plurality of second regions 2 are disposed. Ineach first region 1, a portion of liquid crystal molecules LC are tiltedalong a first tilting direction d1. The liquid crystal molecules LCtiled along the first tilting direction d1 have smaller Δnd in the firsttilting direction d1, and thus there is substantially no light leakageand no luminous flux in the first tilting direction d1. In other words,the main light emitting direction of the liquid crystal molecules LCtiled along the first tilting direction d1 is toward the directionopposite to the first tilting direction d1. In each first region 1,another portion of liquid crystal molecules LC are tilted along a secondtilting direction d2. The liquid crystal molecules LC tiled along thesecond tilting direction d2 have smaller Δnd in the second tiltingdirection d2, and thus there is substantially no light leakage and noluminous flux in the second tilting direction d2. In other words, themain light emitting direction of the liquid crystal molecules LC tiledalong the second tilting direction d2 is toward the direction oppositeto the second tilting direction d2. Accordingly, in each first region 1,the luminous flux is smaller in the first tilting direction d1 and thesecond tilting direction d2, and most luminous flux is substantiallytoward the front viewing direction (not shown) and the first viewingdirection D1 of the liquid crystal display panel 10. Here, the firstviewing direction D1 is defined as the direction opposite to the commondirection of both the first tilting direction d1 and the second tiltingdirection d2 (i.e. the left direction in FIG. 2A and FIG. 2B). On theother hand, in each second region 2, a portion of liquid crystalmolecules LC are tilted along a third tilting direction d3. The liquidcrystal molecules LC tiled along the third tilting direction d3 havesmaller Δnd in the third tilting direction d3, and thus there issubstantially no light leakage and no luminous flux in the third tiltingdirection d3. In other words, the main light emitting direction of theliquid crystal molecules LC tiled along the third tilting direction d3is toward the direction opposite to the third tilting direction d3. Ineach second region 2, another portion of liquid crystal molecules LC aretilted along a fourth tilting direction d4. The liquid crystal moleculesLC tiled along the fourth tilting direction d4 have smaller Δnd in thefourth tilting direction d4, and thus there is substantially no lightleakage and no luminous flux in the fourth tilting direction d4. Inother words, the main light emitting direction of the liquid crystalmolecules LC tiled along the fourth tilting direction d4 is toward thedirection opposite to the fourth tilting direction d4. Accordingly, ineach second region 2, the luminous flux is smaller in the third tiltingdirection d3 and the fourth tilting direction d4, and most luminous fluxis substantially toward the front viewing direction (not shown) and thesecond viewing direction D1 of the liquid crystal display panel 10.Here, the second viewing direction D2 is defined as the directionopposite to the common direction of both the third tilting direction d3and the fourth tilting direction d4 (i.e. the right direction in FIG. 2Aand FIG. 2B).

It is appreciated that the first viewing direction D1 and the secondviewing direction D2 can be modified based on different anti-peepingrequirement. Specifically, the included angle between the first viewingdirection D1 and the second viewing direction D2 is substantiallybetween 90 degrees and 180 degrees. For example, if the anti-peepingdirection of the liquid crystal display panel 10 is required in the leftside and right side, the included angle between the first viewingdirection D1 and the second viewing direction D2 should be set assubstantially 180 degrees. If the anti-peeping direction of the liquidcrystal display panel 10 is required in an oblique direction, forinstance in the upper-left direction (e.g. such as about 130 degrees to140 degrees, specially about 135 degrees) and upper-right direction(e.g. such as about 40 degrees to 50 degrees, specially about 45degrees), or in the bottom-left direction (e.g. such as about 220degrees to 230 degrees, specially about 225 degrees) and bottom-rightdirection (e.g. such as about 310 degrees to 320 degrees, speciallyabout 315 degrees), but not limited, the included angle between thefirst viewing direction D1 and the second viewing direction D2 should beset as substantially 90 degrees, and the first main regions 1 and thesecond main regions 2 should be optionally turned on in differentdomains. In such a case, the viewer cannot see the entire displayedimages in the first viewing direction D1 and the second viewingdirection D2. In addition, the luminous flux of the first region 1 issubstantially toward the first viewing direction D1, but the light beamsof the first region 1 emit divergently to some extent in practice. Forexample, the emitting light beams of the first region 1 are symmetricwith respect to the first viewing direction D1, and the coverage of thelight beams can be modified based on viewing angle requirement such aswithin 180 degrees. Similarly, the luminous flux of the second region 2is substantially toward the second viewing direction D2, but the lightbeams of the second region 2 emit divergently to some extent inpractice. For example, the emitting light beams of the second region 2are symmetric with respect to the second viewing direction D2, and thecoverage of the light beams can be modified based on viewing anglerequirement such as within 180 degrees. In other word, even though thefirst viewing direction D1 and the second viewing direction D2 aredefined as the left side direction and the right side direction, in thenarrow viewing mode, the liquid crystal display panel 10 may have someanti-peeping effect at other view angles except for the upper viewingdirection and the bottom viewing direction. However, the bestanti-peeping effect can be achieved in the first viewing direction D1and the second viewing direction D2.

As shown in FIG. 2A and FIG. 3, in the wide viewing mode, all of thefirst main regions 11, the first sub regions 12, the second main regions21 and the second sub regions 22 in the first domain 101, the seconddomain 102, the third domain 103 and the fourth domain 104 are turnedon, thereby providing brightness. In other words, the overall luminousflux of the first regions 1 is substantially equal to the overallluminous flux of the second regions 2 in different domains.Consequently, when viewing from the front viewing direction, the firstdomain 101, the second domain 102, the third domain 103 and the fourthdomain 104 of the liquid crystal display panel 10 can providebrightness, thereby exhibiting normal display effect. When viewing fromthe first viewing direction D1 or the second viewing direction D2, thefirst domain 101, the second domain 102, the third domain 103 and thefourth domain 104 of the liquid crystal display panel 10 can alsoprovide brightness, thereby exhibiting normal display effect. However,the brightness and information in the first viewing direction D1 and thesecond viewing direction D2 is substantially lower than the brightnessand information in the front viewing direction.

As shown in FIG. 2B and FIG. 4, in the narrow viewing mode, in the firstdomain 101 and in the third domain 103, the first main regions 11 areturned on and provide brightness while the first sub domains 12 areturned off and do not provide brightness; in the second domain 102 andthe fourth domain 104, the second main regions 21 are turned on andprovide brightness while the second sub domains 22 are turned off and donot provide brightness. That is to say, the first sub regions 12 of thefirst domain 101 and the third domain 103 substantially have no luminousflux, but the first main regions 11 of the first domain 101 and thethird domain 103 have luminous flux in the first viewing direction D1;the second sub regions 22 of the second domain 102 and the fourth domain104 substantially have no luminous flux, but the second main regions 21of the second domain 102 and the fourth domain 104 have luminous flux inthe second viewing direction D2. In such a case, when viewing from thefront viewing direction, the liquid crystal display panel 10 can providenormal display effect. When viewing from the first viewing direction D1,the viewer can see the images provided by the first domain 101 and thethird domain 103, but cannot see the images provided by the seconddomain 102 and the fourth domain 104. Therefore, the viewer in the firstviewing direction D1 cannot see the entire images (or namely completeimages or intact images). Similarly, when viewing from the secondviewing direction D2, the viewer can see the images provided by thesecond domain 102 and the fourth domain 104, but cannot see the imagesprovided by the first domain 101 and the third domain 103. Therefore,the viewer in the second viewing direction D2 cannot see the entireimages. Consequently, the liquid crystal display panel 10 can provideanti-peeping effect in the narrow viewing mode.

In this embodiment, each first main region 11, each second main region21, each first sub region 12 and each second sub region 22 as a subpixel, respectively, e.g. a red sub pixel, a green sub pixel, a blue subpixel or a sub pixel for displaying any other color. Each first mainregion 11, each second main region 21, each first sub region 12 and eachsecond sub region 22 is disposed between two adjacent gate line GL andtwo adjacent data line DL, but not limited. For example, in anotherpreferred embodiment, each first main region 11 and an adjacent firstsub region 12 can together form a sub pixel, and each second main region21 and an adjacent second sub region 22 can together form a sub pixel.The first main region 11, the second main region 21, the first subregion 12 and the second sub region 22 can be turned on simultaneously,or one of the first main region 11 and the second main region 21 can beturned on while the other of them can be turned off, or one of the firstsub region 12 and the second sub region 22 can be turned on while theother of them is turned off.

It is to be appreciated that the number and location of domains is notlimited by the above embodiment, and can be modified based on differentanti-peeping requirement. In addition, since the tilting direction ofthe liquid crystal molecules LC is the direction where no light isleaking, the tilting directions of the liquid crystal molecules LC inthe first region 1 and the second region 2 can be modified or increasedto obtain the anti-peeping effect in desired directions.

The distribution of luminous flux in the first regions 1 and the secondregions 2 may be altered by changing the tilting directions of theliquid crystal molecules, for instance, by changing the pattern designof the pixel electrode, the rubbing direction of alignment layers ordisposing protrusion bumps of different patterns. In the followingdescriptions, embodiments of different pattern designs of the pixelelectrode for controlling the luminous flux of the first regions 1 andthe second regions 2 are listed, but not limited thereto. In order tocompare the differences between different embodiments, same componentsare denoted by same numerals, and repeated parts are not redundantlydescribed.

Please refer to FIG. 6A and FIG. 6B. FIG. 6A and FIG. 6B are schematicdiagrams illustrating the circuitry of the liquid crystal display panelaccording to a preferred embodiment of the present invention. Thecircuitry of this embodiment may be applied in the liquid crystaldisplay panel of FIG. 2A and FIG. 2B. FIG. 6A is a circuit diagram ofthe liquid crystal display panel in a wide viewing mode, and FIG. 6B isa circuit diagram of the liquid crystal display panel in a narrowviewing mode. As shown in FIG. 6A and FIG. 6B, a sub pixel is definedbetween two adjacent gate lines GL and two adjacent data lines DL. Eachfirst main region 11 and an adjacent first sub region 12 together form asub pixel, and each second main region 21 and an adjacent second subregion 22 together form a sub pixel. In addition, the liquid crystaldisplay panel 30 is divided into a first domain (or namely first zone)301 and a second domain (or namely second zone) 302 by a vertical baseline V, but not limited thereto. A plurality of first regions 1 aredisposed in the first domain 301, and a plurality of second regions 2are disposed in the second domain 302. The liquid crystal display panel30 further includes a plurality of selecting lines SL, a plurality ofcommon lines CL, a plurality of first main pixel electrodes 321, aplurality of first sub pixel electrodes 322, a plurality of second mainpixel electrodes 341, a plurality of second sub pixel electrodes 342, aplurality of pixel switching devices TFT_(PIX), a plurality of firstselecting switching devices TFT_(S1), and a plurality of secondselecting switching devices TFT_(S2). Each pixel switching deviceTFT_(PIX) is disposed in a corresponding sub pixel, and located betweenthe first main region 11 and the first sub region 12, or between thesecond main region 21 and the second sub region 22. The first main pixelelectrode 321 and the first sub pixel electrode 322 are disposed in thefirst main region 11 and the first sub region 12, respectively, and thefirst main pixel electrode 321 and the first sub pixel electrode 322have different electrode patterns. The second main pixel electrode 341and the second sub pixel electrode 342 are disposed in the second mainregion 21 and the second sub region 22, respectively, and the secondmain pixel electrode 341 and the second sub pixel electrode 342 havedifferent electrode patterns. The pixel switching device TFT_(PIX)includes a gate G_(PIX) electrically connected to the corresponding gateline GL, a source S_(PIX) electrically connected to the correspondingdata line DL, a first drain D_(PIX1) electrically connected to the firstmain pixel electrode 321 of the first domain 301 or the second mainpixel electrode 341 of the second domain 302, and a second drainD_(PIX2) electrically connected to the first sub pixel electrode 322 ofthe first domain 301 or the second sub pixel electrode 342 of the seconddomain 302. In addition, the first selecting switching device TFT_(S1)is disposed in the sub pixel of the first domain 301, and each firstselecting switching device TFT_(S1) includes a gate G_(S1) electricallyconnected to the corresponding selecting line SL, a source S_(S1)electrically connected to the first sub pixel electrode 322 of the firstdomain 301, and a drain D_(S1) electrically connected to thecorresponding common line CL to receive a common voltage V_(COM). Thesecond selecting switching device TFT_(S2) is disposed in the sub pixelof the second domain 302, and each second selecting switching deviceTFT_(S2) includes a gate G_(S2) electrically connected to thecorresponding selecting line SL, a source S_(S2) electrically connectedto the second sub pixel electrode 342 of the second domain 302, and adrain D_(S2) electrically connected to the corresponding common line CL.As shown in FIG. 6A, in the wide viewing mode, the pixel switchingdevices TFT_(PIX) are orderly driven by different gate signals, forinstance by a first gate signal V_(G1) and a second gate signal V_(G2)whose timing is behind that of the first gate signal V_(G1) to be turnedon successively, while the first selecting switching device TFT_(S1) andthe second selecting switching device TFT_(S2) are turned off. When thepixel switching device TFT_(PIX) is turned on, and when the firstselecting switching device TFT_(S1) and the second selecting switchingdevice TFT_(S2) are turned off, the first main regions 11, the first subregions 12, the second main regions 21 and the second sub regions 22 ofall domains can display normally. As shown in FIG. 6B, in the narrowviewing mode, the pixel switching devices TFT_(PIX) are orderly drivenby a first gate signal V_(G1) and a second gate signal V_(G2) to beturned on successively, and the first selecting switching deviceTFT_(S1) and the second selecting switching devices TFT_(S2) are orderlydriven by a first selecting gate signal V_(SG1) and a second selectinggate signal V_(SG2) to be turned on successively. The timing of thefirst selecting gate signal V_(SG1) is behind the timing of the firstgate signal V_(G1), the timing of the second gate signal V_(G2) isbehind the timing of the first selecting gate signal V_(SG1), the timingof the second selecting gate signal V_(SG2) is behind the timing of thesecond gate signal V_(G2), and all the gate signals and the selectinggate signals are applied in the above order. When the first selectingswitching device TFT_(S1) and the second selecting switching deviceTFT_(S2) are turned on, the corresponding first sub pixel electrodes 322of the first sub regions 12 of the first domain 301 and thecorresponding second sub pixel electrodes 342 of the second sub regions22 of the second domain 302 will be received with the common voltageVcom, and thus the first sub regions 12 of the first domain 301 and thesecond sub regions 22 of the second domain 302 will be in a dark statefor not providing luminous flux. By virtue of the selecting lines SL,the first selecting switching device TFT_(S1) and the second selectingswitching device TFT_(S2) operated by the aforementioned driving method,the liquid crystal display panel 30 of the present embodiment canselectively provide the wide viewing mode or the narrow viewing mode.

Please refer to FIG. 7A and FIG. 7B. FIG. 7A and FIG. 7B are schematicdiagrams illustrating the circuitry of the liquid crystal display panelaccording to another preferred embodiment of the present invention. Thecircuitry of this embodiment may be applied in the liquid crystaldisplay panel of FIG. 5A and FIG. 5B. FIG. 7A is a circuit diagram ofthe liquid crystal display panel in a wide viewing mode, and FIG. 7B isa circuit diagram of the liquid crystal display panel in a narrowviewing mode. As shown in FIG. 7A and FIG. 7B, a sub pixel is definedbetween two adjacent gate lines GL and two adjacent data lines DL, andeach first main region 11 and an adjacent first sub region 12 togetherform a sub pixel. The liquid crystal display panel 30 is divided into afirst domain 301 and a second domain 302 by a vertical base line V, butnot limited thereto. The first domain 301 and the second domain 302 onlyinclude the first regions 1. The liquid crystal display panel 30 furtherincludes a plurality of selecting lines SL, a plurality of common linesCL, a plurality of first main pixel electrodes 321, a plurality of firstsub pixel electrodes 322, a plurality of pixel switching devicesTFT_(PIX), a plurality of first selecting switching devices TFT_(S1),and a plurality of second selecting switching devices TFT_(S2). Eachpixel switching device TFT_(PIX) is disposed in a corresponding subpixel, and located between the first main region 11 and the first subregion 12. The first main pixel electrode 321 and the first sub pixelelectrode 322 are disposed in the first main region 11 and the first subregion 12, respectively, and the first main pixel electrode 321 and thefirst sub pixel electrode 322 have different electrode patterns. Thepixel switching device TFT_(PIX) includes a gate G_(PIX) electricallyconnected to the corresponding gate line GL, a source S_(PIX)electrically connected to the corresponding data line DL, a first drainD_(PIX1) electrically connected to the first main pixel electrode 321,and a second drain D_(PIX2) electrically connected to the first subpixel electrode 322. In addition, the first selecting switching deviceTFT_(S1) is disposed in the sub pixel of the first domain 301, and eachfirst selecting switching device TFT_(S1) includes a gate G_(S1)electrically connected to the corresponding selecting line SL, a sourceS_(S1) electrically connected to the first sub pixel electrode 322, anda drain D_(S1) electrically connected to the corresponding common lineCL to receive a common voltage V_(COM). The second selecting switchingdevice TFT_(S2) is disposed in the sub pixel of the second domain 302,and each second selecting switching device TFT_(S2) includes a gateG_(S2) electrically connected to the corresponding selecting line SL, asource S_(S2) electrically connected to the first main pixel electrode321, and a drain D_(S2) electrically connected to the correspondingcommon line CL. As shown in FIG. 7A, in the wide viewing mode, the pixelswitching devices TFT_(PIX) are orderly driven by different gatesignals, for instance by a first gate signal V_(G1) and a second gatesignal V_(G2) whose timing is behind that of the first gate signalV_(G1) to be turned on successively, while the first selecting switchingdevice TFT_(S1) and the second selecting switching device TFT_(S2) areturned off. When the pixel switching device TFT_(PIX) is turned on, andwhen the first selecting switching device TFT_(S1) and the secondselecting switching device TFT_(S2) are turned off, all the first mainregions 11 and the first subregions 12 in the first domain 301 and thesecond domain 302 can display normally. As shown in FIG. 7B, in thenarrow viewing mode, the pixel switching devices TFT_(PIX) are orderlydriven by a first gate signal V_(G1) and a second gate signal V_(G2) tobe turned on successively, and the first selecting switching deviceTFT_(S1) and the second selecting switching devices TFT_(S2) are orderlydriven by a first selecting gate signal V_(SG1) and a second selectinggate signal V_(SG2) to be turned on successively. The timing of thesecond selecting gate signal V_(SG2) is behind the timing of the firstgate signal V_(G1), the timing of the first selecting gate signalV_(SG1) is behind the timing of the second gate signal V_(G2), and thetiming of the second selecting gate signal V_(SG2) is behind the timingof the first selecting gate signal V_(SG1). When the first selectingswitching device TFT_(S1) and the second selecting switching deviceTFT_(S2) are turned on, the corresponding first sub pixel electrodes 322of the first sub regions 12 of the first domain 301 and thecorresponding first main pixel electrodes 321 of the first main regions11 of the second domain 302 will be received with the common voltageVcom, and thus the first sub regions 12 of the first domain 301 and thefirst main regions 11 of the second domain 302 will be in a dark statefor not providing luminous flux. By virtue of the selecting lines SL,the first selecting switching device TFT_(S1) and the second selectingswitching device TFT_(S2) operated by the aforementioned driving method,the liquid crystal display panel 30 of the present embodiment canselectively provide the wide viewing mode or the narrow viewing mode.

The driving method of the liquid crystal display panel of the presentinvention is not limited to the driving method for driving the firstmain regions 11, the first sub regions 12, the second main regions 21and the second sub regions 22 disclosed in the embodiment of FIG. 6A andFIG. 6B, and the driving method for driving the first main regions 11and the first sub regions 12 disclosed in the embodiment of FIG. 7A andFIG. 7B. The liquid crystal display panel of the present invention canalso be driven, for instance, by independent gate lines and data lines,or by shared gate lines with different data lines (i.e. 2D1G drivingmethod), or by shared data lines with different gate lines (i.e. 2G1Ddriving method).

As described, the direction of the luminous flux in the first regionsand the second regions of the liquid crystal display panel can bedecided by the tilting direction of liquid crystal molecules, and thetilting direction of liquid crystal molecules can be adjusted bydesigning the pattern of the pixel electrode. In the followingdescription, different pattern designs of the pixel electrode of thepresent invention will be illustrated in detail.

Please refer to FIG. 8. FIG. 8 is a schematic diagram illustrating afirst pixel electrode and a second pixel electrode of the liquid crystaldisplay panel according to a first preferred embodiment of the presentinvention. As shown in FIG. 8, the first pixel electrode 41 is disposedin a first region 1, and the first pixel electrode 41 includes a firstmain pixel electrode 41M disposed on a first main region 11 of the firstregion 1, and a first sub pixel electrode 41S disposed in a first subregion 12 of the first region 1. The first main pixel electrode 41Mincludes a first trunk electrode 41T1, a second trunk electrode 41T2 anda plurality of first branches 41S1. The first trunk electrode 41T1 andthe second trunk electrode 41T2 of the first main pixel electrode 41Mare electrically connected to each other and substantially arrangedperpendicularly. Specifically, one end of the first trunk electrode 41T1and one end of the second trunk electrode 41T2 of the first main pixelelectrode 41M are electrically connected together, substantially formingan L-shaped electrode or L-shaped like. The first branches 41S1 of thefirst main pixel electrode 41M are electrically connected to one of thefirst trunk electrode 41T1 and the second trunk electrode 41T2, and thefirst branches 41S1 of the first main pixel electrode 41M aresubstantially arranged in parallel along a first direction S1. The firstsub pixel electrode 41S includes a first trunk electrode 41T1, a secondtrunk electrode 41T2, a third trunk electrode 41T3, a plurality of firstbranches 41S1, a plurality of second branches 41S2 and a plurality ofthird branches 41S3. The first trunk electrode 41T1 and the second trunkelectrode 41T2 of the first sub pixel electrode 41S are electricallyconnected to each other and substantially arranged perpendicularly, thesecond trunk electrode 41T2 and the third trunk electrode 41T3 of thefirst sub pixel electrodes 41S are electrically connected to each otherand substantially arranged perpendicularly. Specifically, one end of thefirst trunk electrode 41T1 and one side of the second trunk electrode41T2 are electrically connected together, and one end of the secondtrunk electrode 41T2 and one end of the third trunk electrode 41T3 areelectrically connected together. The first branches 41S1 of the firstsub pixel electrode 41S are electrically connected to one of the firsttrunk electrode 41T1 and the second trunk electrode 41T2, the secondbranches 41S2 of the first sub pixel electrode 41S are electricallyconnected to one of the first trunk electrode 41T1 and the second trunkelectrode 41T2, and the third branches 41S3 of the first sub pixelelectrode 41S are electrically connected to one of the second trunkelectrode 41T2 and the third trunk electrode 41T3. The first branches41S1 of the first sub pixel electrode 41S are substantially arranged inparallel along a second direction S2, the second branches 41S2 of thefirst sub pixel electrode 41S are substantially arranged in parallelalong a third direction S3, and the third branches 41S3 of the first subpixel electrode 41S are substantially arranged in parallel along afourth direction S4. The second pixel electrode 42 further includes asecond main pixel electrode 42M disposed on a second main region 21 ofthe second region 2, and a second sub pixel electrode 42S disposed in asecond sub region 22 of the second region 2. The second main pixelelectrode 42M includes a first trunk electrode 42T1, a second trunkelectrode 42T2 and a plurality of first branches 42S1. The first trunkelectrode 42T1 and the second trunk electrode 42T2 of the second mainpixel electrodes 42M are electrically connected to each other andsubstantially arranged perpendicularly. Specifically, one end of thefirst trunk electrode 42T1 and one end of the second trunk electrode42T2 are electrically connected together, substantially forming anL-shaped electrode or L-shaped like. The first branches 42S1 of thesecond main pixel electrode 42M are electrically connected to one of thefirst trunk electrode 42T1 and the second trunk electrode 42T2, thefirst branches 42S1 of the second main pixel electrode 42M aresubstantially arranged in parallel along the fourth direction S4. Thesecond sub pixel electrode 42S includes a first trunk electrode 42T1, asecond trunk electrode 42T2, a third trunk electrode 42T3, a pluralityof first branches 42S1, a plurality of second branches 42S2 and aplurality of third branches 42S3. The first trunk electrode 42T1 and thesecond trunk electrode 42T2 of the second sub pixel electrodes 42S areelectrically connected to each other and substantially arrangedperpendicularly, and the second trunk electrode 42T2 and the third trunkelectrode 42T3 of the second sub pixel electrodes 42S are electricallyconnected to each other and substantially arranged perpendicularly.Specifically, one end of the first trunk electrode 42T1 and one side ofthe second trunk electrode 42T2 are electrically connected together, andone end of the second trunk electrode 42T2 and one end of the thirdtrunk electrode 42T3 are electrically connected together. The firstbranches 42S1 of the second sub pixel electrode 42S are electricallyconnected to one of the first trunk electrode 42T1 and the second trunkelectrode 42T2, the second branches 42S2 of the second sub pixelelectrode 42S are electrically connected to one of the first trunkelectrode 42T1 and the second trunk electrode 42T2, and the thirdbranches 42S3 of the second sub pixel electrode 42S are electricallyconnected to one of the second trunk electrode 42T2 and the third trunkelectrode 42T3. The first branches 42S1 of the second sub pixelelectrode 42S are substantially arranged in parallel along the thirddirection S3, the second branches 42S2 of the second sub pixel electrode42S are substantially arranged in parallel along the second directionS2, and the third branches 42S3 of the second sub pixel electrode 42Sare substantially arranged in parallel along the first direction S1.Specially, the first pixel electrode 41 and second pixel electrode 42likes a mirror pixel electrode, but not limited it.

By virtue of the above design of pixel electrode, in the wide viewingmode, the first main region 11 and the first sub region 12 of the firstregion 1, and the second main region 21 and the second sub region 22 ofthe second region 2 can be controlled to be turned on simultaneously. Inaddition, by matching the area ratio of the main pixel electrode and thesub pixel electrode, the ratio of the liquid crystal molecules tilted indifferent directions within the main pixel electrode and the sub pixelelectrode will be substantially the same. Consequently, a uniformbrightness of the first regions 1 and the second regions 2 can beprovided toward the front viewing direction and various differentviewing directions, thereby exhibiting multi-domain wide viewing effect.In the narrow viewing mode, the first regions 1 and the second regions 2can be controlled not to be all turned on. For instance, in the seconddomain 102 and the fourth domain 104, the second main regions 21 areturned on while the second sub regions 22 are turned off, and in thefirst domain 101 and the third domain 103, the first main regions 11 areturned on while the first sub regions 12 are turned off as illustratedin FIG. 2B. In such a case, the first regions 1 and the second regions 2can provide brightness toward the front viewing direction, but theviewer can only see part of the displayed images from either the leftside or the right side of the liquid crystal display panel. Thus, theanti-peeping effect can be ensured. According to the design of pixelelectrode of this embodiment, the anti-peeping effect is valid in theupper-left viewing direction and the upper-right viewing direction, andthe best anti-peeping effect is in the upper-left viewing direction(such as about 130 degrees to 140 degrees, specially about 135 degrees)and the upper-right viewing direction (such as about 40 degrees to 50degrees, specially about 45 degrees).

Please refer to FIG. 9. FIG. 9 is a schematic diagram illustrating afirst pixel electrode and a second pixel electrode of the liquid crystaldisplay panel according to a variant embodiment of the first preferredembodiment of the present invention. As shown in FIG. 9, in this variantembodiment, the first pixel electrode 41 and the second pixel electrode42 are similar to those of FIG. 8, and the difference is that thepatterns of the first main pixel electrode 41M, the first sub pixelelectrode 41S, the second main pixel electrode 42M and the second subpixel electrode 42S are slightly modified. Specifically, the first mainpixel electrode 41M further includes a third trunk electrode 41T3 and aplurality of second branches 41S2, and the second main pixel electrode42M further includes a third trunk electrode 42T3 and a plurality ofsecond branches 42S2. In addition, the locations of the first trunkelectrode 41T1 of the first sub pixel electrode 41S and the first trunkelectrode 42T1 of the second sub pixel electrode 42S are slightlymodified while the ratio of the liquid crystal molecules tilted indifferent directions in the wide viewing mode will be substantially thesame. The operation of the first pixel electrodes 41 and the secondpixel electrodes 42 in the wide viewing mode and the narrow viewing modeare similar to that of the aforementioned embodiment, and thus will notbe redundantly described.

Please refer to FIG. 10. FIG. 10 is a schematic diagram illustrating afirst pixel electrode and a second pixel electrode of the liquid crystaldisplay panel according to a second preferred embodiment of the presentinvention. As shown in FIG. 10, the first pixel electrode 41 is disposedin a first region 1, and the first pixel electrode 41 includes a firstmain pixel electrode 41M disposed on a first main region 11 of the firstregion 1, and a first sub pixel electrode 41S disposed in a first subregion 12 of the first region 1. The first main pixel electrode 41Mincludes a first trunk electrode 41T1, a second trunk electrode 41T2, aplurality of first branches 41S1, a plurality of second branches 41S2, aplurality of third branches 41S3 and a plurality of fourth branches41S4. The first branches 41S1, the second branches 41S2, the thirdbranches 41S3 and the fourth branches 41S4 of the first main pixelelectrode 41M are electrically connected to one of the first trunkelectrode 41T1 and the second trunk electrode 41T2. The first trunkelectrode 41T1 and the second trunk electrode 41T2 of the first mainpixel electrode 41M are intersected, forming an asymmetric cross shapedelectrode. That is to say, if an equal point (not shown) divides thefirst trunk electrode 41T1 into two pieces with identical length, theintersection point of the second trunk electrode 41T2 and the firsttrunk electrode 41T1 are not located at the equal point. The firstbranches 41S1 of the first main pixel electrode 41M are substantiallyarranged in parallel along a first direction S1, the second branches41S2 of the first main pixel electrode 41M are substantially arranged inparallel along a second direction S2, the third branches 41S3 of thefirst main pixel electrode 41M are substantially arranged in parallelalong a third direction S3, and the fourth branches 41S4 of the firstmain pixel electrode 41M are substantially arranged in parallel along afourth direction S4. The first sub pixel electrode 41S includes a firsttrunk electrode 41T1, a second trunk electrode 41T2, a plurality offirst branches 41S1, a plurality of second branches 41S2, a plurality ofthird branches 41S3 and a plurality of fourth branches 41S4. The firstbranches 41S1, the second branches 41S2, the third branches 41S3 and thefourth branches 41S4 of the first sub pixel electrode 41S areelectrically connected to one of the first trunk electrode 41T1 and thesecond trunk electrode 41T2. The first trunk electrode 41T1 and thesecond trunk electrode 41T2 of the first sub pixel electrode 41S areintersected, forming an asymmetric cross shaped electrode. That is tosay, if an equal point (not shown) divides the first trunk electrode41T1 into two pieces with identical length, the intersection point ofthe second trunk electrode 41T2 and the first trunk electrode 41T1 arenot located at the equal point. The first branches 41S1 of the first subpixel electrode 41S are substantially arranged in parallel along thesecond direction S2, the second branches 41S2 of the first sub pixelelectrode 41S are substantially arranged in parallel along the firstdirection S1, the third branches 41S3 of the first sub pixel electrode41S are substantially arranged in parallel along the third direction S3,and the fourth branches 41S4 of the first sub pixel electrode 41S aresubstantially arranged in parallel along the fourth direction S4. Thesecond pixel electrode 42 is disposed in a second region 2, and thesecond pixel electrode 42 includes a second main pixel electrode 42Mdisposed on a second main region 21 of the second region 2, and a secondsub pixel electrode 42S disposed in a second sub region 22 of the secondregion 2. The second main pixel electrode 42M includes a first trunkelectrode 42T1, a second trunk electrode 42T2, a plurality of firstbranches 42S1, a plurality of second branches 42S2, a plurality of thirdbranches 42S3 and a plurality of fourth branches 42S4. The firstbranches 42S1, the second branches 42S2, the third branches 42S3 and thefourth branches 42S4 of the second main pixel electrode 42M areelectrically connected to one of the first trunk electrode 42T1 and thesecond trunk electrode 42T2. The first trunk electrode 42T1 and thesecond trunk electrode 42T2 of the second main pixel electrode 42M areintersected, forming an asymmetric cross shaped electrode. That is tosay, if an equal point (not shown) divides the first trunk electrode42T1 into two pieces with identical length, the intersection point ofthe second trunk electrode 42T2 and the first trunk electrode 42T1 arenot located at the equal point. The first branches 42S1 of the secondmain pixel electrodes 42M are substantially arranged in parallel alongthe second direction S2, the second branches 42S2 of the second mainpixel electrode 42M are substantially arranged in parallel along thefirst direction S1, the third branches 42S3 of the second main pixelelectrodes 42M are substantially arranged in parallel along the thirddirection S3, and the fourth branches 42S4 of the second main pixelelectrodes 42M are substantially arranged in parallel along the fourthdirection S4.

The second sub pixel electrode 42S includes a first trunk electrode42T1, a second trunk electrode 42T2, a plurality of first branches 42S1,a plurality of second branches 42S2, a plurality of third branches 42S3and a plurality of fourth branches 42S4. The first branches 42S1, thesecond branches 42S2, the third branches 42S3 and the fourth branches42S4 of the second sub pixel electrode 42S are electrically connected toone of the first trunk electrode 42T1 and the second trunk electrode42T2. The first trunk electrode 42T1 and the second trunk electrode 42T2of the second sub pixel electrode 42S are intersected, forming anasymmetric cross shaped electrode. That is to say, if an equal point(not shown) divides the first trunk electrode 42T1 into two pieces withidentical length, the intersection point of the second trunk electrode42T2 and the first trunk electrode 42T1 are not located at the equalpoint. The first branches 42S1 of the second sub pixel electrode 42S aresubstantially arranged in parallel along the first direction S1, thesecond branches 42S2 of the second sub pixel electrode 42S aresubstantially arranged in parallel along the second direction S2, thethird branches 42S3 of the second sub pixel electrode 42S aresubstantially arranged in parallel along the third direction S3, and thefourth branches 42S4 of the second sub pixel electrode 42S aresubstantially arranged in parallel along the fourth direction S4.

In this embodiment, the first pixel electrode 41 and the second pixelelectrode 42 are mirror symmetric with respect to a symmetry axis S.Specifically, the first main pixel electrode 41M of the first pixelelectrode 41 and the second main pixel electrode 42M of the second pixelelectrode 42 are mirror symmetric with respect to the symmetry axis S,and the first sub pixel electrode 41S of the first pixel electrode 41and the second sub pixel electrode 42S of the second pixel electrode 42are mirror symmetric with respect to the symmetry axis S. In addition,the first main pixel electrode 41M and the first sub pixel electrode 41Sare mirror symmetric with respect to the symmetry axis S, and the secondmain pixel electrode 41S and the second sub pixel electrode 42S aremirror symmetric with respect to the symmetry axis S. With the abovedesign of pixel electrode, in the wide viewing mode, the first mainregion 11 and the first sub region 12 of the first region 1 and thesecond main region 21 and the second sub region 22 of the second region2 can be controlled to be all turned on, and the ratio of the liquidcrystal molecules tilted indifferent directions within the main pixelelectrode and the sub pixel electrode will be substantially the same.Consequently, the first regions 1 and the second regions 2 can provideuniform brightness in various viewing directions, thereby fulfillingmulti-domain wide viewing effect. In the narrow viewing mode, the firstsub region 12 of the first region 1 and the second sub region 22 of thesecond region 2 can be controlled to be turned off, while the first mainregion 11 of the first region 1 and the second main region 21 of thesecond region 2 can be controlled to be turned on. Consequently, theanti-peeping effect can be fulfilled.

In addition, in this embodiment, the second trunk electrode 41T2 of atleast one first main pixel electrode 41M divides the first main region11 into a first sub area 111 and a second sub area 112. The area of thefirst sub area 111 and that of the second sub area 112 of the first mainregion 11 are unequal. Preferably, the ratio of the area of the firstsub area 111 to that of the second sub area 112 of the first main region11 is substantially greater than or equal to 3:1 and less thansubstantially 10:0, but not limited thereto. The second trunk electrode42T2 of at least one second main pixel electrode 21 divides the secondmain region 21 into a first sub area 211 and a second sub area 212. Thearea of the first sub area 211 and that of the second sub area 212 ofthe second main region 21 are unequal. Preferably, the ratio of the areaof the first sub area 211 to that of the second sub area 212 of thesecond main region 21 is substantially greater than or equal to 3:1 andless than 10:0, but not limited thereto. The second trunk electrode 41T2of at least one first sub pixel electrode 41S divides the first subregion 12 into a first sub area 121 and a second sub area 122. The areaof the first sub area 121 and that of the second sub area 122 of thefirst sub region 12 are unequal. Preferably, the ratio of the area ofthe first sub area 121 to that of the second sub area 122 of the firstsub region 12 is substantially greater than or equal to 3:1 andsubstantially less than 10:0, but not limited thereto. The second trunkelectrode 42T2 of at least one second sub pixel electrodes 42S dividesthe second sub region 22 into a first sub area 221 and a second sub area222. The area of the first sub area 221 and that of the second sub area222 of the second sub region 22 are unequal. Preferably, the ratio ofthe area of the first sub area 221 to that of the second sub area 222 ofthe second sub region 22 is substantially greater than or equal to 3:1and substantially less than 10:0, but not limited thereto. Further, thefirst direction S1 is along an angle such as about 130 degrees to 140degrees, specially about 135 degrees, the third direction S3 is along anangle such as about 40 degrees to 50 degrees, specially about 45degrees, the second direction S2 is along an angle such as about 220degrees to 230 degrees, specially about 225 degrees, and the fourthdirection is along an angle such as about 310 degrees to 320 degrees,specially about 315 degrees, but not limited it.

Please refer to Table 1. Table 1 lists simulation results of the ratioof brightness received by two eyes of a viewer in a front viewingdirection and in a side viewing direction under different first subarea-to-second sub area ratio in a narrow viewing mode. It is to beappreciated that a normal direction of the display surface of the liquidcrystal display panel is defined as a direction when the viewingdirection of the viewer and the display surface are perpendicular, i.e.the azimuth angle is zero. Here, the front viewing direction is definedas a direction when the polar angle (i.e. the included angle) betweenthe viewing direction and the normal direction is approximately 5degrees, and the side viewing direction is defined as a direction whenthe polar angle (i.e. the included angle) between the viewing directionand the normal direction is approximately 45 degrees.

TABLE 1 First sub area-to-second sub area ratio 1.5:1 3:1 5.3:1 7:1 10:0Brightness ratio 1.066 1.172 1.243 1.270 1.377 in front viewingdirection Brightness ratio 1.487 2.920 5.034 6.537 87.346 in sideviewing direction

As shown in Table 1, when the area ratio of the first sub area to thesecond sub area is approximately 5.3:1, the brightness ratio received bytwo eyes of the viewer in the front viewing direction is approximately1.243 (i.e. the brightness difference between two eyes is approximately24.3%). This is an acceptable brightness difference because the viewercan clearly distinguish the displayed images. However, the brightnessratio received by two eyes of the viewer in the side viewing directionis approximately 5.034 (i.e. the brightness difference between two eyesis approximately 403.4%). This brightness difference makes it impossiblefor the viewer to distinguish the displayed images, and thus theanti-peeping effect can be achieved. When the area ratio of the firstsub area to the second sub area diminishes, the brightness ratioreceived by two eyes of the viewer in the front viewing direction willreduces, which means the viewer can distinguish the displayed imagesmore clearly. However, the brightness ratio received by two eyes of theviewer in the side viewing direction will reduces as well, which meansthe anti-peeping effect will be adversely affected. For example, whenthe area ratio of the first sub area to the second sub area isapproximately 3:1, the brightness ratio received by two eyes of theviewer in the front viewing direction is approximately 1.172, while thebrightness ratio received by two eyes of the viewer in the side viewingdirection is approximately 2.920; when the area ratio of the first subarea to the second sub area is approximately 1.5:1, the brightness ratioreceived by two eyes of the viewer in the front viewing direction isapproximately 1.066, while the brightness ratio received by two eyes ofthe viewer in the side viewing direction is approximately 1.487. Inaddition, when the area ratio of the first sub area to the second subarea increases, the brightness ratio received by two eyes of the viewerin the side viewing direction will increases, which means theanti-peeping effect can be improved, but the brightness ratio receivedby two eyes of the viewer in the front viewing direction will increasesas well, which means it is difficult for the viewer to distinguish thedisplayed images clearly. For example, when the area ratio of the firstsub area to the second sub area is approximately 7:1, the brightnessratio received by two eyes of the viewer in the front viewing directionis approximately 1.270, while the brightness ratio received by two eyesof the viewer in the side viewing direction is approximately 6.537; whenthe area ratio of the first sub area to the second sub area isapproximately 10:0 (which means no second sub area exists as shown inthe pixel design of FIG. 11), the brightness ratio received by two eyesof the viewer in the front viewing direction is approximately 1.377,while the brightness ratio received by two eyes of the viewer in theside viewing direction is approximately 87.346. It is appreciated thatthe ratio of the area of the first sub area to that of the second subarea can be a trade-off between the front viewing effect and theanti-peeping effect, and not limited to the range disclosed in thisembodiment. Furthermore, in the first main region, the second mainregion, the first sub region and the second sub region, the ratio of thearea of the first sub area to that of the second sub area has not to beequal, but can be modified individually.

Please refer to FIG. 11. FIG. 11 is a schematic diagram illustrating afirst pixel electrode and a second pixel electrode of the liquid crystaldisplay panel according to a variant embodiment of the second preferredembodiment of the present invention. As shown in FIG. 11, the pattern ofthe first pixel electrode 41 and the second pixel electrode 42 in thisvariant embodiment is similar to those of FIG. 10, and the difference isthat the first main pixel electrode 41M only includes the first branches41S1 and the second branches 41S2 arranged along two differentdirections, the first sub pixel electrode 41S only includes the firstbranches 41S1 and the second branches 41S2 arranged along two differentdirections, the second main pixel electrode 42M only includes the firstbranches 42S1 and the second branches 42S2 arranged along two differentdirections, and the second sub pixel electrode 42S only includes thefirst branches 42S1 and the second branches 42S2 arranged along twodifferent directions. In other words, one end of the first trunkelectrode 41T1, 42T1 is connected to one side of the second trunkelectrode 42T1, 42T2, but does not substantially protrude out from theother side of the second trunk electrode 42T1, 42T2. The operation ofthe first pixel electrodes 41 and the second pixel electrodes 42 in thewide viewing mode and the narrow viewing mode are similar to that of theaforementioned embodiment, and thus will not be redundantly described.

It is noted that in the embodiments of FIG. 8-FIG. 11, the branches ofthe first pixel electrode 41 and the second pixel electrode 42 arearranged obliquely, for instance, the azimuth angle of these branchesare about 45 degrees, about 135 degrees, about 225 degrees or about 315degrees, but not limited it. In such a case, the light absorption axes(polarizing axes) of two polarizers of the liquid crystal display panelare preferably about 0 degrees and about 90 degrees, respectively.

Please refer to FIG. 12. FIG. 12 is a schematic diagram illustrating afirst pixel electrode and a second pixel electrode of the liquid crystaldisplay panel according to a third preferred embodiment of the presentinvention. As shown in FIG. 12, the first pixel electrode 41 is disposedin a first region 1, and the first pixel electrode 41 includes a firstmain pixel electrode 41M disposed on a first main region 11 of the firstregion 1, and a first sub pixel electrode 41S disposed in a first subregion 12 of the first region 1. The first main pixel electrode 41Mincludes a first trunk electrode 41T1, a second trunk electrode 41T2, aplurality of first branches 41S1 and a plurality of second branches41S2. The first trunk electrode 41T1 and the second trunk electrode 41T2of the first main pixel electrode 41M are electrically connected to eachother and substantially arranged perpendicularly. Specifically, one endof the first trunk electrode 41T1 and one end of the second trunkelectrode 41T2 of the first main pixel electrode 41M are electricallyconnected together, substantially forming an L-shaped electrode orL-shaped like. The first branches 41S1 of the first main pixel electrode41M are electrically connected to the first trunk electrode 41T1, andthe first branches 41S1 are arranged in substantially parallel along afirst direction S1. The second branches 41S2 of the first main pixelelectrode 41M are electrically connected to the second trunk electrode41T2, and the second branches 41S2 are substantially arranged inparallel along a third direction S3. The first sub pixel electrode 41Sincludes a first trunk electrode 41T1, a second trunk electrode 41T2, aplurality of first branches 41S1 and a plurality of second branches41S2. The first trunk electrode 41T1 and the second trunk electrode 41T2of the first sub pixel electrode 41S are electrically connected to eachother and substantially arranged perpendicularly. Specifically, one endof the first trunk electrode 41T1 and one end of the second trunkelectrode 41T2 of the first sub pixel electrode 41S are electricallyconnected together, substantially forming an L-shaped electrode orL-shaped like. The first branches 41S1 of the first sub pixel electrode41S are electrically connected to the first trunk electrode 41T1, andthe first branches 41S1 are substantially arranged in parallel along asecond direction S2. The second branches 41S2 of the first sub pixelelectrode 41S are electrically connected to the second trunk electrode41T2, and the second branches 41S2 are substantially arranged inparallel along a fourth direction S4. The second pixel electrode 42includes a second main pixel electrode 42M disposed on a second mainregion 21 of the second region 2, and a second sub pixel electrode 42Sdisposed in a second sub region 22 of the second region 2. The secondmain pixel electrode 42M includes a first trunk electrode 42T1, a secondtrunk electrode 42T2, a plurality of first branches 42S1 and a pluralityof second branches 42S2. The first trunk electrode 42T1 and the secondtrunk electrode 42T2 of the second main pixel electrode 42M areelectrically connected to each other and substantially arrangedperpendicularly. Specifically, one end of the first trunk electrode 42T1and one end of the second trunk electrode 42T2 of the second main pixelelectrode 42M are electrically connected together, substantially formingan L-shaped electrode or L-shaped like. The first branches 42S1 of thesecond main pixel electrode 42M are electrically connected to the firsttrunk electrode 42T1, and the first branches 42S1 are arranged inparallel along a fourth direction S4. The second branches 42S2 of thesecond main pixel electrode 42M are electrically connected to the secondtrunk electrode 42T2, and the second branches 42S2 are arranged inparallel along a third direction S3. The second sub pixel electrode 42Sincludes a first trunk electrode 42T1, a second trunk electrode 42T2, aplurality of first branches 42S1 and a plurality of second branches42S2. The first trunk electrode 42T1 and the second trunk electrode 42T2of the second sub pixel electrode 42S are electrically connected to eachother and substantially arranged perpendicularly. Specifically, one endof the first trunk electrode 42T1 and one end of the second trunkelectrode 42T2 of the second sub pixel electrode 42S are electricallyconnected together, substantially forming an L-shaped electrode orL-shaped like. The first branches 42S1 of the second sub pixel electrode42S are electrically connected to the first trunk electrode 42T1, andthe first branches 42S1 are substantially arranged in parallel along asecond direction S2. The second branches 42S2 of the second sub pixelelectrode 42S are electrically connected to the second trunk electrode42T2, and the second branches 42S2 are substantially arranged inparallel along a first direction S1. With the above design of pixelelectrode, in the wide viewing mode, the first main region 11 and thefirst sub region 12 of the first region 1 and the second main region 21and the second sub region 22 of the second region 2 can be controlled tobe all turned on, and the ratio of the liquid crystal molecules tiltedin different directions within the main pixel electrode and the subpixel electrode will be substantially the same. Consequently, the firstregions 1 and the second regions 2 can provide uniform brightness invarious viewing directions, thereby fulfilling multi-domain wide viewingeffect. In the narrow viewing mode, the first sub region 12 of the firstregion 1 and the second sub region 22 of the second region 2 can becontrolled to be turned off, while the first main region 11 of the firstregion 1 and the second main region 21 of the second region 2 can becontrolled to be turned on. Consequently, the anti-peeping effect can befulfilled.

It is noted that in the embodiment of FIG. 12, the branches of the firstpixel electrode 41 and the second pixel electrode 42 are substantiallyarranged in the vertical direction or in the horizontal direction, forinstance, the azimuth angle of these branches are about −5 degree to 5degree, specially about 0 degree, about 85 degree to 95 degree,specially about 90 degrees, about 175 degree to 185 degree, speciallyabout 180 degrees, or about 265 degree to 275 degree, specially about270 degrees, but not limited it. In such a case, the light absorptionaxes (polarizing axes) of two polarizers of the liquid crystal displaypanel are preferably about 45 degrees (or about 225 degrees) and about135 degrees (or about 315 degrees), respectively.

The first main pixel electrode 41M and the second main pixel electrode42M, and the first sub pixel electrode 41S and the second sub pixelelectrode 42S are not limited to be mirror symmetric, and can be anyelectrode pattern that makes the first region 1 and the second region 2have different light emitting directions in the narrow viewing mode. Inaddition, the first main pixel electrode 41M and the second main pixelelectrode 42M can together form a pixel electrode of a sub pixel, andthe first sub pixel electrode 41S and the second sub pixel electrode 42Scan together form a pixel electrode of a sub pixel. Alternatively, eachof the first main pixel electrode 41M, the second main pixel electrode42M, the first sub pixel electrode 41S and the second sub pixelelectrode 42S can be a pixel electrode of different sub pixels.

The liquid crystal display panel of the present invention is not limitedto be a viewing angle switchable liquid crystal display panel, and canbe a liquid crystal display panel with permanent anti-peeping effect.Please refer to FIG. 13 and FIG. 14. FIG. 13 is a schematic diagramillustrating a liquid crystal display panel according to still anotherembodiment of the present invention, and FIG. 14 is a schematic diagramillustrating the liquid crystal display panel when viewed in a frontviewing direction and different side viewing directions. As shown inFIG. 13, the liquid crystal display panel may be divided into aplurality of domains. For example, the liquid crystal display panel 50may be defined to include a first domain 501, a second domain 502, athird domain 503 and a forth domain 504 by a vertical base line V and ahorizontal base line H, but not limited thereto. The first domain 501includes a plurality of first regions 1, the second domain 502 includesa plurality of second regions 2, the third domain 503 includes aplurality of third regions 3, and the fourth domain 504 includes aplurality of fourth regions 4. The first region 1, the second region 2,the third region 3 and the fourth region 4 substantially have differentdesigns of pixel electrode as described previously. Consequently, atleast two of the first domain 501, the second domain 502, the thirddomain 503 and the fourth domain 504 have different light emittingdirections when displaying. In this embodiment, the luminous flux of thefirst region 1 along the first viewing direction is substantiallydifferent from the luminous flux of the first region 1 along a secondviewing direction, a third viewing direction and a fourth viewingdirection different from the first direction. The luminous flux of thesecond region 2 along the second viewing direction is substantiallydifferent from the luminous flux of the second region 2 along the firstviewing direction, the third viewing direction and the fourth viewingdirection different from the second direction. The luminous flux of thethird region 3 along the third viewing direction is substantiallydifferent from the luminous flux of the third region 3 along the firstviewing direction, the second viewing direction and the fourth viewingdirection different from the third direction. The luminous flux of thefourth region 4 along the fourth viewing direction is substantiallydifferent from the luminous flux of the fourth region 4 along the firstviewing direction, the second viewing direction and the third viewingdirection different from the fourth direction. In addition, the luminousflux of the first region 1 along the first viewing direction issubstantially different from the luminous flux of the second region 2,the third region 3 and the fourth region 4 along the first viewingdirection. The luminous flux of the second region 2 along the secondviewing direction is substantially different from the luminous flux ofthe first region 1, the third region 3 and the fourth region 4 along thesecond viewing direction. The luminous flux of the third region 3 alongthe third viewing direction is substantially different from the luminousflux of the first region 1, the second region 2 and the fourth region 4along the third viewing direction. The luminous flux of the fourthregion 4 along the fourth viewing direction is substantially differentfrom the luminous flux of the first region 1, the second region 2 andthe third region 3 along the fourth viewing direction. For example, thefirst domain 501 may have a first light emitting direction L1 (left sidein FIG. 13), the second domain 502 may have a second light emittingdirection L2 (right side in FIG. 13), the third domain 503 may have athird light emitting direction L3 (upper side in FIG. 13), and thefourth domain 504 may have a fourth light emitting direction L4 (bottomside in FIG. 13). The light emitting direction means the luminous fluxin this direction is substantially larger than the luminous flux inother directions. For instance, the luminous flux of the first domain501 in the first light emitting direction L1 is substantially largerthan that in other directions, the luminous flux of the second domain502 in the second light emitting direction L2 is substantially largerthan that in other directions, the luminous flux of the third domain 503in the third light emitting direction L3 is substantially larger thanthat in other directions, and the luminous flux of the fourth domain 504in the fourth light emitting direction L4 is substantially larger thanthat in other directions. Making different domains have different lightemitting directions can be achieved for example by the design of pixelelectrode pattern in the aforementioned embodiments, and are notredundantly described. As shown in FIG. 14, whining viewing from thefront viewing direction, the first domain 501, the second domain 502,the third domain 503 and the fourth domain 504 can all providebrightness, therefore the liquid crystal display panel 50 can displaynormally. When viewing from the left direction, the first domain 501 canemit sufficient luminous flux along the first light emitting directionL1, and therefore can provide normal brightness. The other domainsexcept for the first domain 501 cannot emit sufficient luminous fluxalong the first light emitting direction L1, and thus the brightness ofthe other domains is significantly less than the brightness of the firstdomain 501 when viewing from the left direction. In addition, the secondlight emitting direction L2 of the second domain 502 is completelyopposite to the first light emitting direction L1 (the included anglebetween the first light emitting direction L1 and the second lightemitting direction L2 is approximately 180 degrees), and thus whenviewing from the left direction, the second domain 502 will have thelowest brightness. The third light emitting direction L3 of the thirddomain 503 and the fourth light emitting direction L4 of the fourthdomain 504 are different from but not completely opposite to the firstlight emitting direction L1 (the included angle between the first lightemitting direction L1 and the third light emitting direction L3 isapproximately 90 degrees, and the included angle between the first lightemitting direction L1 and the fourth light emitting direction L4 isapproximately 90 degrees), and therefore the brightness of the thirddomain 503 and the fourth domain 504 is substantially lower than thebrightness of the first domain 501, but substantially higher than thebrightness of the second domain 502. Similarly, when viewing from theright direction, the second domain 502 can emit sufficient luminous fluxalong the second light emitting direction L2, and therefore can providenormal brightness. The other domains except for the second domain 502cannot emit sufficient luminous flux along the second light emittingdirection L2. Thus, the first domain 501 has the lowest brightness, andthe brightness of the third domain 503 and the fourth domain 504 issubstantially lower than the brightness of the second domain 502, butsubstantially higher than the brightness of the first domain 501. Whenviewing from the upper direction, the third domain 503 can emitsufficient luminous flux along the third light emitting direction L3,and therefore can provide normal brightness. The other domains exceptfor the third domain 503 cannot emit sufficient luminous flux along thethird light emitting direction L3. Thus, the fourth domain 504 has thelowest brightness, and the brightness of the first domain 501 and thesecond domain 502 is substantially lower than the brightness of thethird domain 503, but substantially higher than the brightness of thefourth domain 504. When viewing from the bottom direction, the fourthdomain 504 can emit sufficient luminous flux along the fourth lightemitting direction L4, and therefore can provide normal brightness. Theother domains except for the fourth domain 504 cannot emit sufficientluminous flux along the fourth light emitting direction L4. Thus, thethird domain 503 has the lowest brightness, and the brightness of thefirst domain 501 and the second domain 502 is substantially lower thanthe brightness of the fourth domain 504, but substantially higher thanthe brightness of the third domain 503. As a result, the viewer can onlysee the displayed images with uniform brightness from the front viewingdirection. From any side viewing directions, the viewer can only seeinterfered images with uneven brightness. Thus, the liquid crystaldisplay panel 50 can provide the anti-peeping effect.

In conclusion, the liquid crystal display panel of the present inventioncan provide excellent anti-peeping effect by modifying the patterndesign of pixel electrode without changing or adding manufacturingprocess, and the cost and process complexity are not increased. Inaddition, the liquid crystal display panel of the present invention canbe various types of liquid crystal display panels such as transmissiontype, transflective type, reflective type, vertical alignment (VA) type,in-plane switching (IPS) type, multi-domain vertical alignment (MVA),twisted nematic (TN) type, super twisted nematic (STN), patternedvertical alignment (PVA) type, super patterned vertical alignment(S-PVA) type, advanced super view (ASV) type, fringe field switching(FFS) type, Continuous Pinwheel Alignment (CPA) type, axially symmetricaligned micro-cell (ASM) type, optical compensated bend (OCB) type,super in-plane switching (S-IPS) type, advanced super in-plane switching(AS-IPS) type, ultra fringe field switching (UFFS) type, polymerstabilized liquid crystal (PSLC) type, dual-view type, triple-view type,blue phase type, touch input integrated type, electrophoresis type,electro-wetting type, other types, or a combination thereof.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. A liquid crystal display panel, comprising: afirst substrate; a second substrate, disposed oppositely to the firstsubstrate; a liquid crystal layer, disposed between the first substrateand the second substrate; a plurality of first regions and a pluralityof second regions, formed on the first substrate and the secondsubstrate, wherein each of the first regions has a first main region anda first sub region, and each of the second regions has a second mainregion and a second sub region; and a plurality of first pixelelectrodes and a plurality of second pixel electrodes, disposed on thefirst substrate, wherein each of the first pixel electrodes is disposedin each of the first regions, respectively, each of the second pixelelectrodes is disposed in each of the second regions, respectively, thefirst pixel electrode and the second pixel electrode have differentelectrode patterns, each of the first pixel electrodes comprises a firstmain pixel electrode and a first sub pixel electrode, each of the secondpixel electrodes comprises a second main pixel electrode and a secondsub pixel electrode, the first main pixel electrode is disposed in thefirst main region, the first sub pixel electrode is disposed in thefirst sub region, the second main pixel electrode is disposed in thesecond main region, and the second sub pixel electrode is disposed inthe second sub region, wherein the first main pixel electrode and thesecond main pixel electrode are mirror symmetric with respect to asymmetry axis, and the first sub pixel electrode and the second subpixel electrode are mirror symmetric with respect to the symmetry axis.2. The liquid crystal display panel of claim 1, further comprising atleast one first domain and at least one second domain, wherein the firstdomain includes a plurality of first main regions and a plurality offirst sub regions disposed immediately adjoining to each other, and thesecond domain includes a plurality of second main regions and aplurality of second sub regions disposed immediately adjoining to eachother.
 3. The liquid crystal display panel of claim 1, wherein each ofthe first main pixel electrode consists of a first trunk electrode, asecond trunk electrode and a plurality of first branches, the firsttrunk electrode and the second trunk electrode of each of the first mainpixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly to form an L-shaped structure,the first branches of each of the first main pixel electrodes areelectrically connected to one of the first trunk electrode and thesecond trunk electrode, the first branches of each of the first mainpixel electrode are substantially arranged in parallel, each of thesecond main pixel electrodes consists of a first trunk electrode, asecond trunk electrode and a plurality of first branches, the firsttrunk electrode and the second trunk electrode of each of the secondmain pixel electrode are electrically connected to each other andsubstantially arranged perpendicularly to form an L-shaped structure,the first branches of each of the second main pixel electrodes areelectrically connected to one of the first trunk electrode and thesecond trunk electrode, the first branches of each of the second mainpixel electrodes are arranged in parallel, and the first branches ofeach of the first main pixel electrodes and the first branches of eachof the second main pixel electrodes are arranged along differentdirections.
 4. The liquid crystal display panel of claim 3, wherein eachof the first sub pixel electrodes consists of a first trunk electrode, asecond trunk electrode, a third trunk electrode, a plurality of firstbranches, a plurality of second branches and a plurality of thirdbranches, the first trunk electrode and the second trunk electrode ofeach of the first sub pixel electrodes are electrically connected toeach other and substantially arranged perpendicularly to form a T-shapedstructure, the second trunk electrode and the third trunk electrode ofeach of the first sub pixel electrodes are electrically connected toeach other and substantially arranged perpendicularly to form anL-shaped structure, the first branches, the second branches and thethird branches of each of the first sub pixel electrodes areelectrically connected to one of the first trunk electrode, the secondtrunk electrode and the third trunk electrode, the first branches ofeach of the first sub pixel electrodes are substantially arranged inparallel, the second branches of each of the first sub pixel electrodesare substantially arranged in parallel, the third branches of each ofthe first sub pixel electrodes are arranged in parallel, the firstbranches, the second branches and the third branches of each of thefirst sub pixel electrode are arranged along different directions, eachof the second sub pixel electrodes consists of a first trunk electrode,a second trunk electrode, a third trunk electrode, a plurality of firstbranches, a plurality of second branches and a plurality of thirdbranches, the first trunk electrode and the second trunk electrode ofeach of the second sub pixel electrodes are electrically connected toeach other and substantially arranged perpendicularly to form a T-shapedstructure, the second trunk electrode and the third trunk electrode ofeach of the second sub pixel electrodes are electrically connected toeach other and substantially arranged perpendicularly to form anL-shaped structure, the first branches, the second branches and thethird branches of each of the second sub pixel electrodes areelectrically connected to one of the first trunk electrode, the secondtrunk electrode and the third trunk electrode, the first branches ofeach of the second sub pixel electrodes are substantially arranged inparallel, the second branches of each of the second sub pixel electrodesare substantially arranged in parallel, the third branches of each ofthe second sub pixel electrodes are substantially arranged in parallel,and the first branches, the second branches and the third branches ofeach of the second sub pixel electrodes are arranged along differentdirections.
 5. The liquid crystal display panel of claim 1, wherein eachof the first main pixel electrodes comprises a first trunk electrode, asecond trunk electrode, a third trunk electrode, a plurality of firstbranches and a plurality of second branches, the first trunk electrodeand the second trunk electrode of each of the first main pixelelectrodes are electrically connected to each other and substantiallyarranged perpendicularly, the second trunk electrode and the third trunkelectrode of each of the first main pixel electrode are electricallyconnected to each other and substantially arranged perpendicularly, thefirst branches and the second branches of each of the first main pixelelectrodes are electrically connected to one of the first trunkelectrode, the second trunk electrode and the third trunk electrode, thefirst branches of each of the first main pixel electrodes aresubstantially arranged in parallel, the second branches of each of thefirst main pixel electrodes are substantially arranged in parallel, thefirst branches and the second branches of each of the first main pixelelectrodes are arranged along different directions, each of the secondmain pixel electrodes comprises a first trunk electrode, a second trunkelectrode, a third trunk electrode, a plurality of first branches and aplurality of second branches, the first trunk electrode and the secondtrunk electrode of each of the second main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the second trunk electrode and the third trunkelectrode of each of the second main pixel electrodes are electricallyconnected to each other and substantially arranged perpendicularly, thefirst branches and the second branches of each of the second main pixelelectrodes are electrically connected to one of the first trunkelectrode, the second trunk electrode and the third trunk electrode, thefirst branches of each of the second main pixel electrodes aresubstantially arranged in parallel, the second branches of each of thesecond main pixel electrodes are substantially arranged in parallel, andthe first branches and the second branches of each of the second mainpixel electrodes are arranged along different directions.
 6. The liquidcrystal display panel of claim 5, wherein each of the first sub pixelelectrodes comprises a first trunk electrode, a second trunk electrode,a third trunk electrode, a plurality of first branches, a plurality ofsecond branches and a plurality of third branches, the first trunkelectrode and the second trunk electrode of each of the first sub pixelelectrodes are electrically connected to each other and substantiallyarranged perpendicularly, the second trunk electrode and the third trunkelectrode of each of the first sub pixel electrodes are electricallyconnected to each other and substantially arranged perpendicularly, thefirst branches, the second branches and the third branches of each ofthe first sub pixel electrodes are electrically connected to one of thefirst trunk electrode, the second trunk electrode and the third trunkelectrode, the first branches of each of the first sub pixel electrodesare substantially arranged in parallel, the second branches of each ofthe first sub pixel electrodes are substantially arranged in parallel,the third branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the first branches, the secondbranches and the third branches of each of the first sub pixelelectrodes are arranged along different directions, each of the secondsub pixel electrodes comprises a first trunk electrode, a second trunkelectrode, a third trunk electrode, a plurality of first branches, aplurality of second branches and a plurality of third branches, thefirst trunk electrode and the second trunk electrode of each of thesecond sub pixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly, the second trunk electrode andthe third trunk electrode of each of the second sub pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches, the second branches and the thirdbranches of each of the second sub pixel electrodes are electricallyconnected to one of the first trunk electrode, the second trunkelectrode and the third trunk electrode, the first branches of each ofthe second sub pixel electrodes are substantially arranged in parallel,the second branches of each of the second sub pixel electrodes aresubstantially arranged in parallel, the third branches of each of thesecond sub pixel electrodes are substantially arranged in parallel, andthe first branches, the second branches and the third branches of eachof the second sub pixel electrodes are arranged along differentdirections.
 7. The liquid crystal display panel of claim 1, wherein eachof the first main pixel electrodes comprises a first trunk electrode, asecond trunk electrode, a plurality of first branches, a plurality ofsecond branches, a plurality of third branches and a plurality of fourthbranches, the first trunk electrode and the second trunk electrode ofeach of the first main pixel electrode are electrically connected toeach other and substantially arranged perpendicularly, the firstbranches, the second branches, the third branches and the fourthbranches of each of the first main pixel electrodes are electricallyconnected to one of the first trunk electrode and the second trunkelectrode, the first branches of each of the first main pixel electrodesare substantially arranged in parallel, the second branches of each ofthe first main pixel electrodes are substantially arranged in parallel,the third branches of each of the first main pixel electrodes aresubstantially arranged in parallel, the fourth branches of each of thefirst main pixel electrodes are substantially arranged in parallel, thefirst branches, the second branches, the third branches and the fourthbranches of each of the first main pixel electrodes are arranged alongdifferent directions, each of the second main pixel electrodes comprisesa first trunk electrode, a second trunk electrode, a plurality of firstbranches, a plurality of second branches, a plurality of third branchesand a plurality of fourth branches, the first trunk electrode and thesecond trunk electrode of each of the second main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches, the second branches, the thirdbranches and the fourth branches of each of the second main pixelelectrodes are electrically connected to one of the first trunkelectrode and the second trunk electrode, the first branches of each ofthe second main pixel electrodes are substantially arranged in parallel,the second branches of each of the second main pixel electrodes aresubstantially arranged in parallel, the third branches of each of thesecond main pixel electrodes are substantially arranged in parallel, thefourth branches of each of the second main pixel electrodes aresubstantially arranged in parallel, and the first branches, the secondbranches, the third branches and the fourth branches of each of thesecond main pixel electrodes are arranged along different directions. 8.The liquid crystal display panel of claim 7, wherein the second trunkelectrode of at least one of the first main pixel electrodes divides thefirst main region into a first sub area and a second sub area, an areaof the first sub area and that of the second sub area of the first mainregion are unequal, a ratio of the area of the first sub area to that ofthe second sub area of the first main region is substantially greaterthan or equal to 3:1 and substantially less than 10:0, the second trunkelectrode of at least one of the second main pixel electrodes dividesthe second main region into a first sub area and a second sub area, anarea of the first sub area and that of the second sub area of the secondmain region are unequal, and a ratio of the area of the first sub areato that of the second sub area of the second main region issubstantially greater than or equal to 3:1 and less than substantially10:0.
 9. The liquid crystal display panel of claim 1, wherein each ofthe first sub pixel electrodes comprises a first trunk electrode, asecond trunk electrode, a plurality of first branches, a plurality ofsecond branches, a plurality of third branches and a plurality of fourthbranches, the first trunk electrode and the second trunk electrode ofeach of the first sub pixel electrodes are electrically connected toeach other and substantially arranged perpendicularly, the firstbranches, the second branches, the third branches and the fourthbranches of each of the first sub pixel electrodes are electricallyconnected to one of the first trunk electrode and the second trunkelectrode, the first branches of each of the first sub pixel electrodesare substantially arranged in parallel, the second branches of each ofthe first sub pixel electrodes are substantially arranged in parallel,the third branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the fourth branches of each of thefirst sub pixel electrodes are substantially arranged in parallel, thefirst branches, the second branches, the third branches and the fourthbranches of each of the first sub pixel electrodes are arranged alongdifferent directions, each of the second sub pixel electrodes comprisesa first trunk electrode, a second trunk electrode, a plurality of firstbranches, a plurality of second branches, a plurality of third branchesand a plurality of fourth branches, the first trunk electrode and thesecond trunk electrode of each of the second sub pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches, the second branches, the thirdbranches and the fourth branches of each of the second sub pixelelectrodes are electrically connected to one of the first trunkelectrode and the second trunk electrode, the first branches of each ofthe second sub pixel electrodes are substantially arranged in parallel,the second branches of each of the second sub pixel electrodes aresubstantially arranged in parallel, the third branches of each of thesecond sub pixel electrodes are substantially arranged in parallel, thefourth branches of each of the second sub pixel electrodes aresubstantially arranged in parallel, and the first branches, the secondbranches, the third branches and the fourth branches of each of thesecond sub pixel electrodes are arranged along different directions. 10.The liquid crystal display panel of claim 9, wherein the second trunkelectrode of at least one of the first sub pixel electrodes divides thefirst sub region into a first sub area and a second sub area, an area ofthe first sub area and that of the second sub area of the first subregion are unequal, a ratio of the area of the first sub area to that ofthe second sub area of the first sub region is substantially greaterthan or equal to 3:1 and substantially less than 10:0, the second trunkelectrode of at least one of the second sub pixel electrodes divides thesecond sub region into a first sub area and a second sub area, an areaof the first sub area and that of the second sub area of the second subregion are unequal, and a ratio of the area of the first sub area tothat of the second sub area of the second sub region is substantiallygreater than or equal to 3:1 and less than substantially 10:0.
 11. Theliquid crystal display panel of claim 1, wherein each of the first mainpixel electrodes comprises a first trunk electrode, a second trunkelectrode, a plurality of first branches and a plurality of secondbranches, the first trunk electrode and the second trunk electrode ofeach of the first main pixel electrodes are electrically connected toeach other and substantially arranged perpendicularly, the firstbranches and the second branches of each of the first main pixelelectrodes are electrically connected to one of the first trunkelectrode and the second trunk electrode, the first branches of each ofthe first main pixel electrodes are substantially arranged in parallel,the second branches of each of the first main pixel electrodes aresubstantially arranged in parallel, the first branches and the secondbranches of each of the first main pixel electrodes are arranged alongdifferent directions, each of the second main pixel electrodes comprisesa first trunk electrode, a second trunk electrode, a plurality of firstbranches and a plurality of second branches, the first trunk electrodeand the second trunk electrode of each of the second main pixelelectrodes are electrically connected to each other and substantiallyarranged perpendicularly, the first branches and the second branches ofeach of the second main pixel electrodes are electrically connected toone of the first trunk electrode and the second trunk electrode, thefirst branches of each of the second main pixel electrodes aresubstantially arranged in parallel, the second branches of each of thesecond main pixel electrodes are substantially arranged in parallel, andthe first branches and the second branches of each of the second mainpixel electrodes are arranged along different directions.
 12. The liquidcrystal display panel of claim 1, wherein each of the first sub pixelelectrodes comprises a first trunk electrode, a second trunk electrode,a plurality of first branches and a plurality of second branches, thefirst trunk electrode and the second trunk electrode of each of thefirst sub pixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly, the first branches and thesecond branches of each of the first sub pixel electrodes areelectrically connected to one of the first trunk electrode and thesecond trunk electrode, the first branches of each of the first subpixel electrodes are substantially arranged in parallel, the secondbranches of each of the first sub pixel electrodes are substantiallyarranged in parallel, the first branches and the second branches of eachof the first sub pixel electrodes are arranged along differentdirections, each of the second sub pixel electrodes comprises a firsttrunk electrode, a second trunk electrode, a plurality of first branchesand a plurality of second branches, the first trunk electrode and thesecond trunk electrode of each of the second sub pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches and the second branches of each ofthe second sub pixel electrodes are electrically connected to one of thefirst trunk electrode and the second trunk electrode, the first branchesof each of the second sub pixel electrodes are substantially arranged inparallel, the second branches of each of the second sub pixel electrodesare substantially arranged in parallel, and the first branches and thesecond branches of each of the second sub pixel electrodes are arrangedalong different directions.
 13. The liquid crystal display panel ofclaim 1, wherein the first main region and the first sub region of eachof the first regions together form a sub pixel, and the second mainregion and the second sub region of each of the second regions togetherform a sub pixel.
 14. The liquid crystal display panel of claim 13,further comprising a gate line, a data line, a selecting line, a commonline, a plurality of pixel switching devices, a plurality of firstselecting switching devices, and a plurality of second selectingswitching devices, wherein each of the pixel switching devices comprisesa gate electrically connected to the gate line, a source electricallyconnected to the data line, a first drain electrically connected to thefirst main pixel electrode of the first domain or the second main pixelelectrode of the second domain, and a second drain electricallyconnected to the first sub pixel electrode of the first domain or thesecond sub pixel electrode of the second domain, each of the firstselecting switching devices comprises a gate electrically connected tothe selecting line, a source electrically connected to the first subpixel electrode of the first domain, and a drain electrically connectedto the common line, each of the second selecting switching devicescomprises a gate electrically connected to the selecting line, a sourceelectrically connected to the second sub pixel electrode of the seconddomain, and a drain electrically connected to the common line, whereinin the narrow viewing mode, the pixel switching devices, the firstselecting switching devices and the second selecting switching devicesare turned-on, and in a wide viewing mode, the pixel switching devicesare turned on, and the first selecting switching devices and the secondselecting switching devices are turned off.
 15. The liquid crystaldisplay panel of claim 14, wherein in the narrow viewing mode, a timingof a first selecting gate signal of the first selecting switching deviceis behind a timing of a first gate signal of a corresponding pixelswitching device, a timing of a second gate signal of a pixel switchingdevice is behind the timing of the first selecting gate signal of thecorresponding first selecting switching device, a timing of a secondselecting gate signal of the second selecting switching device is behindthe timing of a second gate signal of a corresponding pixel switchingdevice, and the second selecting gate signal, the second gate signal,the first selecting gate signal and the first gate signal are providedorderly.
 16. The liquid crystal display panel of claim 1, wherein eachof the first main regions forms a sub pixel, each of the first subregions forms a sub pixel, each of the second main regions forms a subpixel, and each of the second sub regions forms a sub pixel.
 17. Theliquid crystal display panel of claim 1, further comprising a pluralityof pixel electrodes, a plurality of third regions and a plurality offourth regions formed on the first substrate and the second substrate,the pixel electrodes disposed in the first region, the second region,the third region and the fourth region having different pixel electrodepatterns, wherein the pixel electrodes disposed in the first region, thesecond region, the third region and the fourth region are electricallyconnected to different pixel switching devices, and wherein the liquidcrystal display panel comprises a first domain, a second domain, a thirddomain and a fourth domain, the first regions are disposed in the firstdomain, the second regions are disposed in the second domain, the thirdregions are disposed in the third domain, the fourth regions aredisposed in the fourth domain, in a narrow viewing mode, a luminous fluxof the first regions along a first viewing direction is different fromthat of the first regions along a second viewing direction, a thirdviewing direction and a fourth viewing direction different from thefirst viewing direction, a luminous flux of the second regions along thesecond viewing direction is different from that of the second regionsalong the first viewing direction, the third viewing direction and thefourth viewing direction, a luminous flux of the third regions along thethird viewing direction is different from that of the third regionsalong the first viewing direction, the second viewing direction and thefourth viewing direction, a luminous flux of the fourth regions alongthe fourth viewing direction is different from that of the fourthregions along the first viewing direction, the second viewing directionand the third viewing direction, the luminous flux of the first regionsalong the first viewing direction is different from those of the secondregions, the third regions and the fourth regions along the firstviewing direction, the luminous flux of the second regions along thesecond viewing direction is different from those of the first regions,the third regions and the fourth regions along the second viewingdirection, the luminous flux of the third regions along the thirdviewing direction is different from those of the first regions, thesecond regions and the fourth regions along the third viewing direction,and the luminous flux of the fourth regions along the fourth viewingdirection is different from those of the first regions, the secondregions and the third regions along the fourth viewing direction.
 18. Aliquid crystal display panel, comprising: a first substrate; a secondsubstrate, disposed oppositely to the first substrate; a liquid crystallayer, disposed between the first substrate and the second substrate; aplurality of first regions, a plurality of second regions, a pluralityof third regions and a plurality of fourth regions, formed on the firstsubstrate and the second substrate; and a plurality of pixel electrodesdisposed on the first substrate, wherein the pixel electrodes disposedin the first region, the second region, the third region and the fourthregion have different pixel electrode patterns, and the pixel electrodesdisposed in the first region, the second region, the third region andthe fourth region are electrically connected to different pixelswitching devices, wherein the liquid crystal display panel comprises afirst domain, a second domain, a third domain and a fourth domain, thefirst regions are disposed in the first domain, the second regions aredisposed in the second domain, the third regions are disposed in thethird domain, the fourth regions are disposed in the fourth domain, in anarrow viewing mode, the luminous flux of the first regions along afirst viewing direction is different from that of the first regionsalong a second viewing direction, a third viewing direction and a fourthviewing direction different from the first viewing direction, theluminous flux of the second regions along the second viewing directionis different from that of the second regions along the first viewingdirection, the third viewing direction and the fourth viewing direction,the luminous flux of the third regions along the third viewing directionis different from that of the third regions along the first viewingdirection, the second viewing direction and the fourth viewingdirection, the luminous flux of the fourth regions along the fourthviewing direction is different from that of the fourth regions along thefirst viewing direction, the second viewing direction and the thirdviewing direction, the luminous flux of the first regions along thefirst viewing direction is different from those of the second regions,the third regions and the fourth regions along the first viewingdirection, the luminous flux of the second regions along the secondviewing direction is different from those of the first regions, thethird regions and the fourth regions along the second viewing direction,the luminous flux of the third regions along the third viewing directionis different from those of the first regions, the second regions and thefourth regions along the third viewing direction, and the luminous fluxof the fourth regions along the fourth viewing direction is differentfrom those of the first regions, the second regions and the thirdregions along the fourth viewing direction.
 19. The liquid crystaldisplay panel of claim 18, wherein each of the first regions has a firstmain region and a first sub region, each of the second regions has asecond main region and a second sub region, the first domain includes aplurality of first main regions and a plurality of first sub regions,and the second domain includes a plurality of second main regions and aplurality of second sub regions.
 20. The liquid crystal display panel ofclaim 19, wherein the pixel electrodes comprises a plurality of firstpixel electrodes and a plurality of second pixel electrodes, each of thefirst pixel electrodes comprises a first main pixel electrode and afirst sub pixel electrode, each of the second pixel electrodes comprisesa second main pixel electrode and a second sub pixel electrode, thefirst main pixel electrode is disposed in the first main region, thefirst sub pixel electrode is disposed in the first sub region, thesecond main pixel electrode is disposed in the second main region, andthe second sub pixel electrode is disposed in the second sub region. 21.The liquid crystal display panel of claim 20, wherein the first mainregion and the first sub region of each of the first regions togetherform a sub pixel, and the second main region and the second sub regionof each of the second regions together form a sub pixel.
 22. The liquidcrystal display panel of claim 21, further comprising a gate line, adata line, a selecting line, a common line, a plurality of pixelswitching devices, a plurality of first selecting switching devices, anda plurality of second selecting switching devices, wherein each of thepixel switching devices comprises a gate electrically connected to thegate line, a source electrically connected to the data line, a firstdrain electrically connected to the first main pixel electrode of thefirst domain or the second main pixel electrode of the second domain,and a second drain electrically connected to the first sub pixelelectrode of the first domain or the second sub pixel electrode of thesecond domain, each of the first selecting switching devices comprises agate electrically connected to the selecting line, a source electricallyconnected to the first sub pixel electrode of the first domain, and adrain electrically connected to the common line, each of the secondselecting switching devices comprises a gate electrically connected tothe selecting line, a source electrically connected to the second subpixel electrode of the second domain, and a drain electrically connectedto the common line, wherein in the narrow viewing mode, the pixelswitching devices, the first selecting switching devices and the secondselecting switching devices are turned-on, and in a wide viewing mode,the pixel switching devices are turned on, and the first selectingswitching devices and the second selecting switching devices are turnedoff.
 23. The liquid crystal display panel of claim 22, wherein in thenarrow viewing mode, a timing of a first selecting gate signal of thefirst selecting switching device is behind a timing of a first gatesignal of a corresponding pixel switching device, a timing of a secondgate signal of a pixel switching device is behind the timing of thefirst selecting gate signal of the corresponding first selectingswitching device, a timing of a second selecting gate signal of thesecond selecting switching device is behind the timing of a second gatesignal of a corresponding pixel switching device, and the secondselecting gate signal, the second gate signal, the first selecting gatesignal and the first gate signal are provided orderly.
 24. The liquidcrystal display panel of claim 19, wherein each of the first mainregions forms a sub pixel, each of the first sub regions forms a subpixel, each of the second main regions forms a sub pixel, and each ofthe second sub regions forms a sub pixel.
 25. A liquid crystal displaypanel, comprising: a first substrate; a second substrate, disposedoppositely to the first substrate; a liquid crystal layer, disposedbetween the first substrate and the second substrate; a plurality offirst regions and a plurality of second regions, formed on the firstsubstrate and the second substrate, wherein each of the first regionshas a first main region and a first sub region, and each of the secondregions has a second main region and a second sub region; a firstdomain; a second domain; a plurality of first pixel electrodes disposedon the first substrate, wherein each of the first pixel electrodescomprises a first main pixel electrode and a first sub pixel electrode,the first main pixel electrode is disposed in the first main region, andthe first sub pixel electrode is disposed in the first sub region; and aplurality of second pixel electrodes disposed on the first substrate,wherein each of the second pixel electrodes comprises a second mainpixel electrode and a second sub pixel electrode, the second main pixelelectrode is disposed in the second main region, the second sub pixelelectrode is disposed in the second sub region, each of the first pixelelectrodes is disposed in each of the first regions, respectively, eachof the second pixel electrodes is disposed in each of the secondregions, respectively, the first pixel electrode and the second pixelelectrode have different electrode patterns, the first domain includes aplurality of first regions disposed immediately adjoining to each other,and the second domain includes a plurality of second regions disposedimmediately adjoining to each other.
 26. The liquid crystal displaypanel of claim 25, wherein in the narrow viewing mode, the luminous fluxof the first regions along the first viewing direction is substantiallylarger than that of the first regions along the second viewingdirection, and a luminous flux of the second regions along the secondviewing direction is substantially larger than that of the secondregions along the first viewing direction.
 27. The liquid crystaldisplay panel of claim 25, wherein in a wide viewing mode, an overallluminous flux of the first regions is substantially equal to that of thesecond regions.
 28. The liquid crystal display panel of claim 25,wherein in the narrow viewing mode, the first sub regions of the firstdomain have substantially no luminous flux, a luminous flux of the firstmain regions of the first domain along the first viewing direction isdifferent from that of the first main regions of the first domain alongthe second viewing direction, the second sub regions of the seconddomain have substantially no luminous flux, a luminous flux of thesecond main regions of the second domain along second viewing directionis different from that of the second main regions of the second domainalong the first viewing direction, the luminous flux of the first mainregions along the first viewing direction is different from that of thesecond main regions along the first viewing direction, and the luminousflux of the first main regions along the second viewing direction isdifferent from that of the second main regions along the second viewingdirection.
 29. The liquid crystal display panel of claim 25, whereineach of the first main pixel electrodes comprises a first trunkelectrode, a second trunk electrode, a third trunk electrode, aplurality of first branches and a plurality of second branches, thefirst trunk electrode and the second trunk electrode of each of thefirst main pixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly, the second trunk electrode andthe third trunk electrode of each of the first main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches and the second branches of each ofthe first main pixel electrodes are electrically connected to one of thefirst trunk electrode, the second trunk electrode and the third trunkelectrode, the first branches of each of the first main pixel electrodesare substantially arranged in parallel, the second branches of each ofthe first main pixel electrodes are substantially arranged in parallel,the first branches and the second branches of each of the first mainpixel electrodes are arranged along different directions, each of thesecond main pixel electrode comprises a first trunk electrode, a secondtrunk electrode, a third trunk electrode, a plurality of first branchesand a plurality of second branches, the first trunk electrode and thesecond trunk electrode of each of the second main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the second trunk electrode and the third trunkelectrode of each of the second main pixel electrodes are electricallyconnected to each other and substantially arranged perpendicularly, thefirst branches and the second branches of each of the second main pixelelectrodes are electrically connected to one of the first trunkelectrode, the second trunk electrode and the third trunk electrode, thefirst branches of each of the second main pixel electrodes aresubstantially arranged in parallel, the second branches of each of thesecond main pixel electrodes are substantially arranged in parallel, andthe first branches and the second branches of each of the second mainpixel electrodes are arranged along different directions.
 30. The liquidcrystal display panel of claim 29, wherein each of the first sub pixelelectrodes comprises a first trunk electrode, a second trunk electrode,a third trunk electrode, a plurality of first branches, a plurality ofsecond branches and a plurality of third branches, the first trunkelectrode and the second trunk electrode of each of the first sub pixelelectrodes are electrically connected to each other and substantiallyarranged perpendicularly, the second trunk electrode and the third trunkelectrode of each of the first sub pixel electrodes are electricallyconnected to each other and substantially arranged perpendicularly, thefirst branches, the second branches and the third branches of each ofthe first sub pixel electrodes are electrically connected to one of thefirst trunk electrode, the second trunk electrode and the third trunkelectrode, the first branches of each of the first sub pixel electrodesare substantially arranged in parallel, the second branches of each ofthe first sub pixel electrodes are substantially arranged in parallel,the third branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the first branches, the secondbranches and the third branches of each of the first sub pixelelectrodes are arranged along different directions, each of the secondsub pixel electrodes comprises a first trunk electrode, a second trunkelectrode, a third trunk electrode, a plurality of first branches, aplurality of second branches and a plurality of third branches, thefirst trunk electrode and the second trunk electrode of each of thesecond sub pixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly, the second trunk electrode andthe third trunk electrode of each of the second sub pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches, the second branches and the thirdbranches of each of the second sub pixel electrodes are electricallyconnected to one of the first trunk electrode, the second trunkelectrode and the third trunk electrode, the first branches of each ofthe second sub pixel electrodes are substantially arranged in parallel,the second branches of each of the second sub pixel electrodes aresubstantially arranged in parallel, the third branches of each of thesecond sub pixel electrodes are substantially arranged in parallel, andthe first branches, the second branches and the third branches of eachof the second sub pixel electrodes are arranged along differentdirections.
 31. The liquid crystal display panel of claim 25, whereineach of the first main pixel electrodes comprises a first trunkelectrode, a second trunk electrode, a plurality of first branches, aplurality of second branches, a plurality of third branches and aplurality of fourth branches, the first trunk electrode and the secondtrunk electrode of each of the first main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches, the second branches, the thirdbranches and the fourth branches of each of the first main pixelelectrodes are electrically connected to one of the first trunkelectrode and the second trunk electrode, the first branches of each ofthe first main pixel electrodes are substantially arranged in parallel,the second branches of each of the first main pixel electrodes aresubstantially arranged in parallel, the third branches of each of thefirst main pixel electrodes are substantially arranged in parallel, thefourth branches of each of the first main pixel electrodes aresubstantially arranged in parallel, the first branches, the secondbranches, the third branches and the fourth branches of each of thefirst main pixel electrodes are arranged along different directions,each of the second main pixel electrodes comprises a first trunkelectrode, a second trunk electrode, a plurality of first branches, aplurality of second branches, a plurality of third branches and aplurality of fourth branches, the first trunk electrode and the secondtrunk electrode of each of the second main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches, the second branches, the thirdbranches and the fourth branches of each of the second main pixelelectrodes are electrically connected to one of the first trunkelectrode and the second trunk electrode, the first branches of each ofthe second main pixel electrodes are substantially arranged in parallel,the second branches of each of the second main pixel electrode aresubstantially arranged in parallel, the third branches of each of thesecond main pixel electrodes are substantially arranged in parallel, thefourth branches of each of the second main pixel electrodes aresubstantially arranged in parallel, and the first branches, the secondbranches, the third branches and the fourth branches of each of thesecond main pixel electrodes are arranged along different directions.32. The liquid crystal display panel of claim 31, wherein the secondtrunk electrode of at least one of the first main pixel electrodesdivides the first main region into a first sub area and a second subarea, an area of the first sub area and that of the second sub area ofthe first main region are unequal, a ratio of the area of the first subarea to that of the second sub area of the first main region issubstantially greater than or equal to 3:1 and substantially less than10:0, the second trunk electrode of at least one of the second mainpixel electrodes divides the second main region into a first sub areaand a second sub area, an area of the first sub area and that of thesecond sub area of the second main region are unequal, and a ratio ofthe area of the first sub area to that of the second sub area of thesecond main region is substantially greater than or equal to 3:1 andsubstantially less than 10:0.
 33. The liquid crystal display panel ofclaim 25, wherein each of the first sub pixel electrodes comprises afirst trunk electrode, a second trunk electrode, a plurality of firstbranches, a plurality of second branches, a plurality of third branchesand a plurality of fourth branches, the first trunk electrode and thesecond trunk electrode of each of the first sub pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly, the first branches, the second branches, the thirdbranches and the fourth branches of each of the first sub pixelelectrodes are electrically connected to one of the first trunkelectrode and the second trunk electrode, the first branches of each ofthe first sub pixel electrodes are substantially arranged in parallel,the second branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the third branches of each of thefirst sub pixel electrodes are substantially arranged in parallel, thefourth branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the first branches, the secondbranches, the third branches and the fourth branches of each of thefirst sub pixel electrodes are arranged along different directions, eachof the second sub pixel electrode comprises a first trunk electrode, asecond trunk electrode, a plurality of first branches, a plurality ofsecond branches, a plurality of third branches and a plurality of fourthbranches, the first trunk electrode and the second trunk electrode ofeach of the second sub pixel electrodes are electrically connected toeach other and substantially arranged perpendicularly, the firstbranches, the second branches, the third branches and the fourthbranches of each of the second sub pixel electrodes are electricallyconnected to one of the first trunk electrode and the second trunkelectrode, the first branches of each of the second sub pixel electrodesare substantially arranged in parallel, the second branches of each ofthe second sub pixel electrodes are substantially arranged in parallel,the third branches of each of the second sub pixel electrodes aresubstantially arranged in parallel, the fourth branches of each of thesecond sub pixel electrodes are substantially arranged in parallel, andthe first branches, the second branches, the third branches and thefourth branches of each of the second sub pixel electrodes are arrangedalong different directions.
 34. The liquid crystal display panel ofclaim 33, wherein the second trunk electrode of at least one of thefirst sub pixel electrodes divides the first sub region into a first subarea and a second sub area, an area of the first sub area and that ofthe second sub area of the first sub region are unequal, a ratio of thearea of the first sub area to that of the second sub area of the firstsub region is substantially greater than or equal to 3:1 andsubstantially less than 10:0, the second trunk electrode of at least oneof the second sub pixel electrodes divides the second sub region into afirst sub area and a second sub area, an area of the first sub area andthat of the second sub area of the second sub region are unequal, and aratio of the area of the first sub area to that of the second sub areaof the second sub region is substantially greater than or equal to 3:1and substantially less than 10:0.
 35. The liquid crystal display panelof claim 25, wherein each of the first main pixel electrodes comprises afirst trunk electrode, a second trunk electrode, a plurality of firstbranches and a plurality of second branches, the first trunk electrodeand the second trunk electrode of each of the first main pixelelectrodes are electrically connected to each other and substantiallyarranged perpendicularly, the first branches and the second branches ofeach of the first main pixel electrodes are electrically connected toone of the first trunk electrode and the second trunk electrode, thefirst branches of each of the first main pixel electrodes aresubstantially arranged in parallel, the second branches of each of thefirst main pixel electrodes are substantially arranged in parallel, thefirst branches and the second branches of each of the first main pixelelectrodes are arranged along different directions, each of the secondmain pixel electrodes comprises a first trunk electrode, a second trunkelectrode, a plurality of first branches and a plurality of secondbranches, the first trunk electrode and the second trunk electrode ofeach of the second main pixel electrodes are electrically connected toeach other and substantially arranged perpendicularly, the firstbranches and the second branches of each of the second main pixelelectrodes are electrically connected to one of the first trunkelectrode and the second trunk electrode, the first branches of each ofthe second main pixel electrodes are substantially arranged in parallel,the second branches of each of the second main pixel electrodes aresubstantially arranged in parallel, and the first branches and thesecond branches of each of the second main pixel electrodes are arrangedalong different directions.
 36. The liquid crystal display panel ofclaim 25, wherein each of the first sub pixel electrodes comprises afirst trunk electrode, a second trunk electrode, a plurality of firstbranches and a plurality of second branches, the first trunk electrodeand the second trunk electrode of each of the first sub pixel electrodesare electrically connected to each other and substantially arrangedperpendicularly, the first branches and the second branches of each ofthe first sub pixel electrodes are electrically connected to one of thefirst trunk electrode and the second trunk electrode, the first branchesof each of the first sub pixel electrodes are substantially arranged inparallel, the second branches of each of the first sub pixel electrodesare substantially arranged in parallel, the first branches and thesecond branches of each of the first sub pixel electrodes are arrangedalong different directions, each of the second sub pixel electrodescomprises a first trunk electrode, a second trunk electrode, a pluralityof first branches and a plurality of second branches, the first trunkelectrode and the second trunk electrode of each of the second sub pixelelectrodes are electrically connected to each other and substantiallyarranged perpendicularly, the first branches and the second branches ofeach of the second sub pixel electrodes are electrically connected toone of the first trunk electrode and the second trunk electrode, thefirst branches of each of the second sub pixel electrodes aresubstantially arranged in parallel, the second branches of each of thesecond sub pixel electrodes are substantially arranged in parallel, andthe first branches and the second branches of each of the second subpixel electrodes are arranged along different directions.
 37. The liquidcrystal display panel of claim 25, wherein the first main region and thefirst sub region of each of the first regions together form a sub pixel,and the second main region and the second sub region of each of thesecond regions together form a sub pixel.
 38. The liquid crystal displaypanel of claim 37, further comprising a gate line, a data line, aselecting line, a common line, a plurality of pixel switching devices, aplurality of first selecting switching devices, and a plurality ofsecond selecting switching devices, wherein each of the pixel switchingdevices comprises a gate electrically connected to the gate line, asource electrically connected to the data line, a first drainelectrically connected to the first main pixel electrode of the firstdomain or the second main pixel electrode of the second domain, and asecond drain electrically connected to the first sub pixel electrode ofthe first domain or the second sub pixel electrode of the second domain,each of the first selecting switching devices comprises a gateelectrically connected to the selecting line, a source electricallyconnected to the first sub pixel electrode of the first domain, and adrain electrically connected to the common line, each of the secondselecting switching devices comprises a gate electrically connected tothe selecting line, a source electrically connected to the second subpixel electrode of the second domain, and a drain electrically connectedto the common line, wherein in the narrow viewing mode, the pixelswitching devices, the first selecting switching devices and the secondselecting switching devices are turned-on, and in a wide viewing mode,the pixel switching devices are turned on, and the first selectingswitching devices and the second selecting switching devices are turnedoff.
 39. The liquid crystal display panel of claim 38, wherein in thenarrow viewing mode, a timing of a first selecting gate signal of thefirst selecting switching device is behind a timing of a first gatesignal of a corresponding pixel switching device, a timing of a secondgate signal of a pixel switching device is behind the timing of thefirst selecting gate signal of the corresponding first selectingswitching device, a timing of a second selecting gate signal of thesecond selecting switching device is behind the timing of a second gatesignal of a corresponding pixel switching device, and the secondselecting gate signal, the second gate signal, the first selecting gatesignal and the first gate signal are provided orderly.
 40. The liquidcrystal display panel of claim 25, wherein each of the first main regionforms a sub pixel, each of the first sub regions forms a sub pixel, eachof the second main regions forms a sub pixel, and each of the second subregions forms a sub pixel.
 41. The liquid crystal display panel of claim25, wherein the first main pixel electrode and the second main pixelelectrode are mirror symmetric with respect to a symmetry axis, and thefirst sub pixel electrode and the second sub pixel electrode are mirrorsymmetric with respect to a symmetry axis.
 42. The liquid crystaldisplay panel of claim 25, wherein the first main pixel electrode andthe first sub pixel electrode are mirror symmetric with respect to asymmetry axis, and the second main pixel electrode and the second subpixel electrode are mirror symmetric with respect to a symmetry axis.43. The liquid crystal display panel of claim 25, further comprising aplurality of third regions and a plurality of fourth regions formed onthe first substrate and the second substrate, the first region, thesecond region, the third region and the fourth region having differentpixel electrode patterns, wherein the first pixel electrodes are furtherdisposed in the third regions respectively, the second pixel electrodesare further disposed in the fourth regions, and the first pixelelectrode disposed in the first region, the second pixel electrodedisposed in the second region, the first pixel electrode disposed in thethird region and the second pixel electrode disposed in the fourthregion are electrically connected to different pixel switching devices,and wherein the liquid crystal display panel comprises a first domain, asecond domain, a third domain and a fourth domain, the first regions aredisposed in the first domain, the second regions are disposed in thesecond domain, the third regions are disposed in the third domain, thefourth regions are disposed in the fourth domain, in a narrow viewingmode, the luminous flux of the first regions along the first viewingdirection is different from that of the first regions along the secondviewing direction, a third viewing direction and a fourth viewingdirection different from the first viewing direction, the luminous fluxof the second regions along the second viewing direction is differentfrom that of the second regions along the first viewing direction, thethird viewing direction and the fourth viewing direction, the luminousflux of the third regions along the third viewing direction is differentfrom that of the third regions along the first viewing direction, thesecond viewing direction and the fourth viewing direction, the luminousflux of the fourth regions along the fourth viewing direction isdifferent from that of the fourth regions along the first viewingdirection, the second viewing direction and the third viewing direction,the luminous flux of the first regions along the first viewing directionis different from those of the second regions, the third regions and thefourth regions along the first viewing direction, the luminous flux ofthe second regions along the second viewing direction is different fromthose of the first regions, the third regions and the fourth regionsalong the second viewing direction, the luminous flux of the thirdregions along the third viewing direction is different from those of thefirst regions, the second regions and the fourth regions along the thirdviewing direction, and the luminous flux of the fourth regions along thefourth viewing direction is different from those of the first regions,the second regions and the third regions along the fourth viewingdirection.
 44. A liquid crystal display panel, comprising: a firstsubstrate; a second substrate, disposed oppositely to the firstsubstrate; a liquid crystal layer, disposed between the first substrateand the second substrate; a plurality of first regions and a pluralityof second regions, formed on the first substrate and the secondsubstrate, wherein each of the first regions has a first main region anda first sub region, and each of the second regions has a second mainregion and a second sub region; a first domain; a second domain; aplurality of first pixel electrodes disposed on the first substrate,wherein each of the first pixel electrodes comprises a first main pixelelectrode and a first sub pixel electrode, the first main pixelelectrode is disposed in the first main region, and the first sub pixelelectrode is disposed in the first sub region; and a plurality of secondpixel electrodes disposed on the first substrate, wherein each of thesecond pixel electrodes comprises a second main pixel electrode and asecond sub pixel electrode, the second main pixel electrode is disposedin the second main region, the second sub pixel electrode is disposed inthe second sub region, each of the first pixel electrodes is disposed ineach of the first regions, respectively, each of the second pixelelectrodes is disposed in each of the second regions, respectively, thefirst pixel electrode and the second pixel electrode have differentelectrode patterns, the first domain includes a plurality of firstregions disposed immediately adjoining to each other, and the seconddomain includes a plurality of second regions disposed immediatelyadjoining to each other, wherein each of the first main pixel electrodesconsists of a first trunk electrode, a second trunk electrode and aplurality of first branches, the first trunk electrode and the secondtrunk electrode of each of the first main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly to form an L-shaped structure, the first branches ofeach of the first main pixel electrodes are electrically connected toone of the first trunk electrode and the second trunk electrode, thefirst branches of each of the first main pixel electrodes aresubstantially arranged in parallel, each of the second main pixelelectrodes consists of a first trunk electrode, a second trunk electrodeand a plurality of first branches, the first trunk electrode and thesecond trunk electrode of each of the second main pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly to form an L-shaped structure, the first branches ofeach of the second main pixel electrodes are electrically connected toone of the first trunk electrode and the second trunk electrode, thefirst branches of each of the second main pixel electrodes aresubstantially arranged in parallel, and the first branches of each ofthe first main pixel electrodes and the first branches of each of thesecond main pixel electrodes are arranged along different directions,and wherein each of the first sub pixel electrodes consists of a firsttrunk electrode, a second trunk electrode, a third trunk electrode, aplurality of first branches, a plurality of second branches and aplurality of third branches, the first trunk electrode and the secondtrunk electrode of each of the first sub pixel electrodes areelectrically connected to each other and substantially arrangedperpendicularly to form a T-shaped structure, the second trunk electrodeand the third trunk electrode of each of the first sub pixel electrodesare electrically connected to each other and substantially arrangedperpendicularly to form an L-shaped structure, the first branches, thesecond branches and the third branches of each of the first sub pixelelectrodes are electrically connected to one of the first trunkelectrode, the second trunk electrode and the third trunk electrode, thefirst branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the second branches of each of thefirst sub pixel electrodes are substantially arranged in parallel, thethird branches of each of the first sub pixel electrodes aresubstantially arranged in parallel, the first branches, the secondbranches and the third branches of each of the first sub pixelelectrodes are arranged along different directions, each of the secondsub pixel electrode consists of a first trunk electrode, a second trunkelectrode, a third trunk electrode, a plurality of first branches, aplurality of second branches and a plurality of third branches, thefirst trunk electrode and the second trunk electrode of each of thesecond sub pixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly to form a T-shaped structure, thesecond trunk electrode and the third trunk electrode of each of thesecond sub pixel electrodes are electrically connected to each other andsubstantially arranged perpendicularly to form an L-shaped structure,the first branches, the second branches and the third branches of eachof the second sub pixel electrodes are electrically connected to one ofthe first trunk electrode, the second trunk electrode and the thirdtrunk electrode, the first branches of each of the second sub pixelelectrodes are substantially arranged in parallel, the second branchesof each of the second sub pixel electrodes are substantially arranged inparallel, the third branches of each of the second sub pixel electrodesare substantially arranged in parallel, and the first branches, thesecond branches and the third branches of each of the second sub pixelelectrodes are arranged along different directions.
 45. The liquidcrystal display panel of claim 44, wherein in a narrow viewing mode, thefirst regions and the second regions have a first viewing direction anda second viewing direction, and the first viewing direction is oppositeto the second viewing direction.
 46. The liquid crystal display panel ofclaim 45, wherein in the narrow viewing mode, a luminous flux of thefirst regions along the first viewing direction is different from thatof the first regions along the second viewing direction, a luminous fluxof the second regions along the first viewing direction is differentfrom that of the first regions along the first viewing direction, thefirst sub regions of the first domain have substantially no luminousflux, a luminous flux of the first main regions of the first domainalong the first viewing direction is different from that of the firstmain regions of the first domain along the second viewing direction, thesecond sub regions of the second domain have substantially no luminousflux, a luminous flux of the second main regions of the second domainalong second viewing direction is different from that of the second mainregions of the second domain along the first viewing direction, theluminous flux of the first main regions along the first viewingdirection is different from that of the second main regions along thefirst viewing direction, and the luminous flux of the first main regionsalong the second viewing direction is different from that of the secondmain regions along the second viewing direction.
 47. The liquid crystaldisplay panel of claim 44, wherein the first main pixel electrode andthe second main pixel electrode are mirror symmetric with respect to asymmetry axis, and the first sub pixel electrode and the second subpixel electrode are mirror symmetric with respect to the symmetry axis.48. The liquid crystal display panel of claim 44, further comprising aplurality of pixel electrodes, a plurality of third regions and aplurality of fourth regions formed on the first substrate and the secondsubstrate, the pixel electrodes disposed in the first region, the secondregion, the third region and the fourth region having different pixelelectrode patterns, wherein the pixel electrodes disposed in the firstregion, the second region, the third region and the fourth region areelectrically connected to different pixel switching devices, and whereinthe liquid crystal display panel comprises a third domain and a fourthdomain, the third regions are disposed in the third domain, and thefourth regions are disposed in the fourth domain.